[ Eq(Derivative(x1, t), 0),
  Eq(Derivative(x2, t), (1*(k1*x15 - k2*x2) + 1*k18*k4*x3*k20)/k18),
  Eq(Derivative(x3, t), (1*(k1*x16 - k2*x3) + (-1)*k18*(k6*x3*x8 - k7*x7) + (-2)*k18*(k6*x3*x3 - k7*x6) + (-1)*k18*k4*x3*k20 + (-1)*k18*(k6*x3*x5 - k7*x9))/k18),
  Eq(Derivative(x4, t), (1*k18*k4*x5*k20 + 1*(k1*x17 - k2*x4))/k18),
  Eq(Derivative(x5, t), ((-1)*k18*k4*x5*k20 + 1*(k1*x18 - k2*x5) + (-2)*k18*(k6*x5*x5 - k7*x11) + (-1)*k18*(k6*x3*x5 - k7*x9) + (-1)*k18*(k6*x5*x8 - k7*x10))/k18),
  Eq(Derivative(x6, t), (1*k5*x12 + 1*k18*(k6*x3*x3 - k7*x6))/k18),
  Eq(Derivative(x7, t), (1*k18*(k6*x3*x8 - k7*x7) + 1*k5*x13)/k18),
  Eq(Derivative(x8, t), (1*(k1*x14 - k1*x8) + (-1)*k18*(k6*x3*x8 - k7*x7) + (-1)*k18*(k6*x5*x8 - k7*x10))/k18),
  Eq(Derivative(x9, t), (1*k18*(k6*x3*x5 - k7*x9) + 1*k5*x19)/k18),
  Eq(Derivative(x10, t), (1*k18*(k6*x5*x8 - k7*x10) + 1*k5*x20)/k18),
  Eq(Derivative(x11, t), (1*k18*(k6*x5*x5 - k7*x11) + 1*k5*x21)/k18),
  Eq(Derivative(x12, t), ((-1)*k5*x12 + 1*k19*(k6*x16*x16 - k7*x12))/k19),
  Eq(Derivative(x13, t), (1*k19*(k6*x16*x14 - k7*x13) + (-1)*k5*x13)/k19),
  Eq(Derivative(x14, t), ((-1)*(k1*x14 - k1*x8) + (-1)*k19*(k6*x16*x14 - k7*x13) + (-1)*k19*(k6*x18*x14 - k7*x20))/k19),
  Eq(Derivative(x15, t), ((-1)*(k1*x15 - k2*x2) + (-1)*k19*k3*x23*x15)/k19),
  Eq(Derivative(x16, t), ((-1)*(k1*x16 - k2*x3) + 1*k19*k3*x23*x15 + (-1)*k19*(k6*x16*x14 - k7*x13) + (-2)*k19*(k6*x16*x16 - k7*x12) + (-1)*k19*(k6*x16*x18 - k7*x19))/k19),
  Eq(Derivative(x17, t), ((-1)*k19*k3*x17*x23 + (-1)*(k1*x17 - k2*x4))/k19),
  Eq(Derivative(x18, t), (1*k19*k3*x17*x23 + (-1)*(k1*x18 - k2*x5) + (-2)*k19*(k6*x18*x18 - k7*x21) + (-1)*k19*(k6*x16*x18 - k7*x19) + (-1)*k19*(k6*x18*x14 - k7*x20))/k19),
  Eq(Derivative(x19, t), (1*k19*(k6*x16*x18 - k7*x19) + (-1)*k5*x19)/k19),
  Eq(Derivative(x20, t), (1*k19*(k6*x18*x14 - k7*x20) + (-1)*k5*x20)/k19),
  Eq(Derivative(x21, t), (1*k19*(k6*x18*x18 - k7*x21) + (-1)*k5*x21)/k19),
  Eq(Derivative(x22, t), 0),
  Eq(Derivative(x23, t), (1*k19*k12*x24*k21 + (-1)*k19*(k10*x23*x26 - k11*x25))/k19),
  Eq(Derivative(x24, t), (-1)*k19*k12*x24*k21/k19),
  Eq(Derivative(x25, t), 1*k19*(k10*x23*x26 - k11*x25)/k19) ]