{ diff(x1, t) = ((-1)*k5*k9*x1*k24 + 1*k5*k17*x8*x10)/k5,
  diff(x2, t) = (2*k5*k9*x1*k24 + (-1)*k5*k10*x2*x10)/k5,
  diff(x3, t) = (1*k5*k10*x2*x10 + (-2)*k5*(k11*x3^2 - k12*x4*x14) + (-1)*k5*k14*x6*x3 + (-1)*k5*k16*x5*x3 + (-1)*k21*x3*x19)/k5,
  diff(x4, t) = (1*k5*(k11*x3^2 - k12*x4*x14) + (-1)*k5*k13*x4 + (-1)*k5*k19*x10*x4 + 1*k5*k20*x9*x14)/k5,
  diff(x5, t) = (1*k5*k13*x4 + 1*k5*k15*x7 + (-1)*k5*k16*x5*x3)/k5,
  diff(x6, t) = (1*k5*k13*x4 + (-1)*k5*k14*x6*x3)/k5,
  diff(x7, t) = (1*k5*k14*x6*x3 + (-1)*k5*k15*x7)/k5,
  diff(x8, t) = (1*k5*k15*x7 + 1*k5*k16*x5*x3 + (-1)*k5*k17*x8*x10)/k5,
  diff(x9, t) = (1*k5*k19*x10*x4 + (-1)*k5*k20*x9*x14)/k5,
  diff(x10, t) = ((-1)*k5*k10*x2*x10 + (-1)*k5*k17*x8*x10 + 1*k5*k18*x11*x14 + (-1)*k5*k19*x10*x4)/k5,
  diff(x11, t) = (1*k5*k10*x2*x10 + 1*k5*k17*x8*x10 + (-1)*k5*k18*x11*x14 + 1*k5*k19*x10*x4)/k5,
  diff(x12, t) = ((-1)*129/5000*x17*x12 + 1*k23*x13*x19)/k5,
  diff(x13, t) = (1*129/5000*x17*x12 + (-1)*k23*x13*x19)/k5,
  diff(x14, t) = (1*k5*k10*x2*x10 + 1*k5*(k11*x3^2 - k12*x4*x14) + 1*k5*k14*x6*x3 + (-1)*k5*k18*x11*x14 + 2*k5*k19*x10*x4 + (-1)*k5*k20*x9*x14 + 1*k21*x3*x19)/k5,
  diff(x15, t) = 0,
  diff(x16, t) = (1*k21*x3*x19 + (-2)*k6*k22*x16^2)/k6,
  diff(x17, t) = (1*k6*k22*x16^2 + (-2)*129/5000*x17*x12)/k6,
  diff(x18, t) = (1*129/5000*x17*x12 + (-1)*k1*x18 + (-1)*(k2*x18 - k2*x20) + (-1)*(k3*x18 - k3*k25))/k6,
  diff(x19, t) = ((-1)*k21*x3*x19 + 1*k6*k22*x16^2 + 3*129/5000*x17*x12 + (-1)*k23*x13*x19)/k6,
  diff(x20, t) = 1*(k2*x18 - k2*x20)/k7,
  diff(x21, t) = 0,
  diff(x22, t) = 0 }