{ diff(x1, t) = (-1)*k76*(k1*x1*x51/k2 - k3*x2)/k76,
  diff(x2, t) = (1*k76*(k1*x1*x51/k2 - k3*x2) + (-1)*k76*(k44*x31*x2 - k45*x35))/k76,
  diff(x3, t) = ((-1)*k76*(k4*x3*x51/k2 - k5*x4) + (-1)*k76*k70*x3*x39)/k76,
  diff(x4, t) = (1*k76*(k4*x3*x51/k2 - k5*x4) + (-1)*k76*(k46*x31*x4 - k47*x36) + (-1)*k76*(k62*x6*x4 - k63*x46) + 1*k76*k64*x46)/k76,
  diff(x5, t) = (-1)*k76*(k6*x5*x51/k2 - k7*x6)/k76,
  diff(x6, t) = (1*k76*(k6*x5*x51/k2 - k7*x6) + (-1)*k76*(k38*x6*x16 - k39*x32) + (-1)*k76*(k41*x6*x33 - k42*x34) + (-1)*k76*(k62*x6*x4 - k63*x46))/k76,
  diff(x7, t) = (-1)*k76*(k8*x7*x51/k2 - k9*x8)/k76,
  diff(x8, t) = (1*k76*(k8*x7*x51/k2 - k9*x8) + (-1)*k76*(k36*x16*x8 - k37*x31) + 1*k76*k40*x32 + 1*k76*k43*x34 + (-1)*k76*(k53*x37*x8 - k54*x43) + 1*k76*k64*x46)/k76,
  diff(x9, t) = (-1)*k76*(k10*x9*x51/k2 - k11*x10)/k76,
  diff(x10, t) = (1*k76*(k10*x9*x51/k2 - k11*x10) + (-1)*k76*(k28*x25*x10 - k29*x27) + (-1)*k76*(k50*x10*x16 - k51*x45))/k76,
  diff(x11, t) = (-1)*k76*(k12*x11*x51/k2 - k13*x12)/k76,
  diff(x12, t) = (1*k76*(k12*x11*x51/k2 - k13*x12) + (-1)*k76*(k26*x25*x12 - k27*x26) + 1*k76*k52*x45)/k76,
  diff(x13, t) = (-1)*k76*(k14*x13*x51/k2 - k15*x14)/k76,
  diff(x14, t) = (1*k76*(k14*x13*x51/k2 - k15*x14) + (-1)*k76*(k30*x26*x14 - k31*x28))/k76,
  diff(x15, t) = ((-1)*(k16*x15*x51/k2 - k17*x16) + (-1)*k76*(k56*x38*x15 - k57*x41) + (-1)*k76*k60*x15*x39 + (-1)*k76*k75*x52*x15)/k76,
  diff(x16, t) = (1*(k16*x15*x51/k2 - k17*x16) + 1*k76*k73*x29 + (-1)*k76*(k33*x27*x16 - k34*x30) + 1*k76*k35*x30 + (-1)*k76*(k36*x16*x8 - k37*x31) + (-1)*k76*(k38*x6*x16 - k39*x32) + 1*k76*k40*x32 + (-1)*k76*(k50*x10*x16 - k51*x45) + 1*k76*k52*x45)/k76,
  diff(x17, t) = (-1)*k76*(k18*x17*x51/k2 - k19*x18)/k76,
  diff(x18, t) = (1*k76*(k18*x17*x51/k2 - k19*x18) + 1*k76*k69*x49 + (-1)*k76*(k71*x18*x20 - k72*x37))/k76,
  diff(x19, t) = (-1)*k76*(k20*x19*x51/k2 - k21*x20)/k76,
  diff(x20, t) = (1*k76*(k20*x19*x51/k2 - k21*x20) + (-1)*k76*(k71*x18*x20 - k72*x37))/k76,
  diff(x21, t) = (-1)*k76*(k22*x21*x51/k2 - k23*x22)/k76,
  diff(x22, t) = (1*k76*(k22*x21*x51/k2 - k23*x22) + 1*k76*k55*x43)/k76,
  diff(x23, t) = (-1)*k76*(k24*x23*x51/k2 - k25*x24)/k76,
  diff(x24, t) = (1*k76*(k24*x23*x51/k2 - k25*x24) + (-1)*k76*(k67*x48*x24 - k68*x49))/k76,
  diff(x25, t) = ((-1)*k76*(k26*x25*x12 - k27*x26) + (-1)*k76*(k28*x25*x10 - k29*x27))/k76,
  diff(x26, t) = (1*k76*(k26*x25*x12 - k27*x26) + (-1)*k76*(k30*x26*x14 - k31*x28) + 1*k76*k73*x29 + 1*k76*k35*x30 + (-1)*k76*(k58*x41*x26 - k59*x42))/k76,
  diff(x27, t) = (1*k76*(k28*x25*x10 - k29*x27) + (-1)*k76*(k33*x27*x16 - k34*x30))/k76,
  diff(x28, t) = (1*k76*(k30*x26*x14 - k31*x28) + (-1)*k76*k32*x28)/k76,
  diff(x29, t) = (1*k76*k32*x28 + (-1)*k76*k73*x29)/k76,
  diff(x30, t) = (1*k76*(k33*x27*x16 - k34*x30) + (-1)*k76*k35*x30)/k76,
  diff(x31, t) = (1*k76*(k36*x16*x8 - k37*x31) + (-1)*k76*(k44*x31*x2 - k45*x35) + (-1)*k76*(k46*x31*x4 - k47*x36) + 1*k76*k49*x36)/k76,
  diff(x32, t) = (1*k76*(k38*x6*x16 - k39*x32) + (-1)*k76*k40*x32)/k76,
  diff(x33, t) = ((-1)*k76*(k41*x6*x33 - k42*x34) + 1*k76*k43*x34 + 1*k76*k49*x36 + (-1)*k76*k61*x33*x39 + (-1)*k76*(k65*x33*x47 - k66*x48) + (-1)*k76*k74*x52*x33)/k76,
  diff(x34, t) = (1*k76*(k41*x6*x33 - k42*x34) + (-1)*k76*k43*x34)/k76,
  diff(x35, t) = (1*k76*(k44*x31*x2 - k45*x35) + (-1)*k76*k48*x35)/k76,
  diff(x36, t) = (1*k76*(k46*x31*x4 - k47*x36) + 1*k76*k48*x35 + (-1)*k76*k49*x36)/k76,
  diff(x37, t) = ((-1)*k76*(k53*x37*x8 - k54*x43) + 1*k76*k55*x43 + 1*k76*(k71*x18*x20 - k72*x37))/k76,
  diff(x38, t) = (-1)*k76*(k56*x38*x15 - k57*x41)/k76,
  diff(x39, t) = ((-1)*k76*k60*x15*x39 + (-1)*k76*k61*x33*x39 + (-1)*k76*k70*x3*x39)/k76,
  diff(x40, t) = 1*k76*k61*x33*x39/k76,
  diff(x41, t) = (1*k76*(k56*x38*x15 - k57*x41) + (-1)*k76*(k58*x41*x26 - k59*x42))/k76,
  diff(x42, t) = 1*k76*(k58*x41*x26 - k59*x42)/k76,
  diff(x43, t) = (1*k76*(k53*x37*x8 - k54*x43) + (-1)*k76*k55*x43)/k76,
  diff(x44, t) = 1*k76*k60*x15*x39/k76,
  diff(x45, t) = (1*k76*(k50*x10*x16 - k51*x45) + (-1)*k76*k52*x45)/k76,
  diff(x46, t) = (1*k76*(k62*x6*x4 - k63*x46) + (-1)*k76*k64*x46)/k76,
  diff(x47, t) = (-1)*k76*(k65*x33*x47 - k66*x48)/k76,
  diff(x48, t) = (1*k76*(k65*x33*x47 - k66*x48) + (-1)*k76*(k67*x48*x24 - k68*x49) + 1*k76*k69*x49)/k76,
  diff(x49, t) = (1*k76*(k67*x48*x24 - k68*x49) + (-1)*k76*k69*x49)/k76,
  diff(x50, t) = 1*k76*k70*x3*x39/k76,
  diff(x51, t) = ((-100)*k76*(k1*x1*x51/k2 - k3*x2) + (-100)*k76*(k4*x3*x51/k2 - k5*x4) + (-100)*k76*(k6*x5*x51/k2 - k7*x6) + (-100)*k76*(k8*x7*x51/k2 - k9*x8) + (-100)*k76*(k10*x9*x51/k2 - k11*x10) + (-100)*k76*(k12*x11*x51/k2 - k13*x12) + (-100)*k76*(k14*x13*x51/k2 - k15*x14) + (-100)*(k16*x15*x51/k2 - k17*x16) + (-100)*k76*(k18*x17*x51/k2 - k19*x18) + (-100)*k76*(k20*x19*x51/k2 - k21*x20) + (-100)*k76*(k22*x21*x51/k2 - k23*x22) + (-100)*k76*(k24*x23*x51/k2 - k25*x24) + 100*k76*k49*x36)/k76,
  diff(x52, t) = ((-1)*k76*k74*x52*x33 + (-1)*k76*k75*x52*x15)/k76,
  diff(x53, t) = 1*k76*k74*x52*x33/k76,
  diff(x54, t) = 1*k76*k75*x52*x15/k76 }