[ Eq(Derivative(x1, t), (1*(k1*(1 + k15*k20*(x11 + x12)) - k3*(1 + k18*k15)*x1) + (-2)*(k7*x1**2*x4**2 - k10*x5) + (-2)*(k8*x1**2*x2 - k11*x3))/k26),
  Eq(Derivative(x2, t), ((-1)*(k8*x1**2*x2 - k11*x3) + (-1)*(k16*x2*x13 - k17*x14))/k26),
  Eq(Derivative(x3, t), 1*(k8*x1**2*x2 - k11*x3)/k26),
  Eq(Derivative(x4, t), ((-2)*k5*x4**2 + (-2)*(k7*x1**2*x4**2 - k10*x5) + (-1)*k9*x4*x7 + 2*k6*x6)/k26),
  Eq(Derivative(x5, t), 1*(k7*x1**2*x4**2 - k10*x5)/k26),
  Eq(Derivative(x6, t), (1*k5*x4**2 + 1*k12*x8**2 + (-1)*k6*x6)/k26),
  Eq(Derivative(x7, t), (1*(k2*(1 + k15*x5) - k4*x7) + (-1)*k9*x4*x7 + 2*k12*x8**2)/k26),
  Eq(Derivative(x8, t), (1*k9*x4*x7 + (-2)*k12*x8**2)/k26),
  Eq(Derivative(x9, t), 0/k26),
  Eq(Derivative(x10, t), 0/k26),
  Eq(Derivative(x11, t), 1*(k13*(1 + k19*k15) - k14*(x3/(k21 + x3) + x14/(k22 + x14) - x5/(k23 + x5))*x11)/k26),
  Eq(Derivative(x12, t), 0/k26),
  Eq(Derivative(x13, t), (-1)*(k16*x2*x13 - k17*x14)/k26),
  Eq(Derivative(x14, t), 1*(k16*x2*x13 - k17*x14)/k26) ]