[ Eq(Derivative(x1, t), 0/k16),
  Eq(Derivative(x2, t), ((-1)*k1*x1**3*k14**2*x18/((x18 + k14)*(x1**2*k14**2 + k13*x18**2 + 2*k13*k14*x18 + k13*k14**2))*x2*k16 + 1*k2*x7*k16)/k16),
  Eq(Derivative(x3, t), (-1)*k3*x3*x7*k16/k16),
  Eq(Derivative(x4, t), (-1)*k11*x4*(x10 + x11)*k16/k16),
  Eq(Derivative(x5, t), (-1)*k12*x5*(x10 + x11)*k16/k16),
  Eq(Derivative(x6, t), (-1)*k12*x6*x11*k16/k16),
  Eq(Derivative(x7, t), (1*k1*x1**3*k14**2*x18/((x18 + k14)*(x1**2*k14**2 + k13*x18**2 + 2*k13*k14*x18 + k13*k14**2))*x2*k16 + (-1)*k2*x7*k16 + (-1)*k3*x3*x7*k16 + 1*k4*x10*k16 + 1*k5*x10*(x8 + x9)*k16 + 1*k6*x10*x10*k16 + 1*k7*x9*k16 + 1*k8*x9*(x8 + x9)*k16 + 1*k9*x9*x10*k16)/k16),
  Eq(Derivative(x8, t), (1*k3*x3*x7*k16 + (-1)*k4*x8*k16 + (-1)*k5*x8*(x8 + x9)*k16 + (-1)*k6*x8*x10*k16 + (-1)*k7*x8*k16 + (-1)*k8*x8*(x8 + x9)*k16 + (-1)*k9*x8*x10*k16)/k16),
  Eq(Derivative(x9, t), (1*k4*x8*k16 + 1*k5*x8*(x8 + x9)*k16 + 1*k6*x8*x10*k16 + (-1)*k7*x9*k16 + (-1)*k8*x9*(x8 + x9)*k16 + (-1)*k9*x9*x10*k16)/k16),
  Eq(Derivative(x10, t), ((-1)*k4*x10*k16 + (-1)*k5*x10*(x8 + x9)*k16 + (-1)*k6*x10*x10*k16 + 1*k7*x8*k16 + 1*k8*x8*(x8 + x9)*k16 + 1*k9*x8*x10*k16)/k16),
  Eq(Derivative(x11, t), (1*k4*x10*k16 + 1*k5*x10*(x8 + x9)*k16 + 1*k6*x10*x10*k16 + 1*k7*x9*k16 + 1*k8*x9*(x8 + x9)*k16 + 1*k9*x9*x10*k16 + (-1)*k10*x11*k16)/k16),
  Eq(Derivative(x12, t), 1*k10*x11*k16/k16),
  Eq(Derivative(x13, t), 1*k11*x4*(x10 + x11)*k16/k16),
  Eq(Derivative(x14, t), 1*k12*x5*(x10 + x11)*k16/k16),
  Eq(Derivative(x15, t), 1*k12*x5*(x10 + x11)*k16/k16),
  Eq(Derivative(x16, t), 1*k12*x6*x11*k16/k16),
  Eq(Derivative(x17, t), 1*k12*x6*x11*k16/k16),
  Eq(Derivative(x18, t), 0/k16) ]