{ diff(x1, t) = 0,
  diff(x2, t) = 0,
  diff(x3, t) = 0,
  diff(x4, t) = (1*k31*x23 + (-1)*k28*x4)/k32,
  diff(x5, t) = 0,
  diff(x6, t) = (1*(k23 + k22*x23) + (-1)*k20*x6)/k32,
  diff(x7, t) = (1*k19*x6 + (-1)*k21*x7)/k32,
  diff(x8, t) = 0,
  diff(x9, t) = ((-1)*k11*x9 + 1*(k5*x11 + k4*x11*x7))/k32,
  diff(x10, t) = 0,
  diff(x11, t) = (1*k1*x12 + (-1)*k6*x11 + 1*k8*x15 + (-1)*k9*x11*x14 + 1*k10*x17 + (-1)*(k5*x11 + k4*x11*x7) + (-1)*k7*x11*x21)/k32,
  diff(x12, t) = ((-1)*k1*x12 + (-1)*k2*x12 + 1*k3)/k32,
  diff(x13, t) = 0,
  diff(x14, t) = ((-1)*k12*x14 + (-1)*k9*x11*x14 + 1*(k13*x22*x21 - k14*x14) + 1*(k29*x20 - k30*x14))/k32,
  diff(x15, t) = ((-1)*k8*x15 + 1*k7*x11*x21)/k32,
  diff(x16, t) = 0,
  diff(x17, t) = (1*k9*x11*x14 + (-1)*k10*x17)/k32,
  diff(x18, t) = 0,
  diff(x19, t) = 0,
  diff(x20, t) = ((-5)*(k29*x20 - k30*x14) + 1*(k15*x23*x24 - k16*x20))/k33,
  diff(x21, t) = ((-1)*k24*x21 + 1*k25*x4 + (-1)*(k13*x22*x21 - k14*x14) + (-1)*k7*x11*x21 + (-1)*(k26*x21 - k27*x24))/k32,
  diff(x22, t) = (1*k12*x14 + 1*k10*x17 + (-1)*(k13*x22*x21 - k14*x14) + (-1)*(k17*x22 - k18*x23))/k32,
  diff(x23, t) = (5*(k17*x22 - k18*x23) + (-1)*(k15*x23*x24 - k16*x20))/k33,
  diff(x24, t) = ((-1)*(k15*x23*x24 - k16*x20) + 5*(k26*x21 - k27*x24))/k33 }