[ Eq(Derivative(x1, t), (1*k19*k1 + (-1)*k19*k2*x1*x2 + (-1)*k19*k3*x1*(x8 - x2) + (-1)*k19*k4*x1*x4 + (-1)*k19*k5*x1*x3 + (-1)*k9*x1/100*k19)/k19),
  Eq(Derivative(x2, t), ((-1)*k19*k2*x1*x2 + 1*k19*k3*x1*(x8 - x2) + 1*k19*k12*(x8 - x2) + (-1)*k19*k13*x2)/k19),
  Eq(Derivative(x3, t), (1*k19*k3*x1*(x8 - x2) + (-1)*k19*k5*x1*x3 + (-1)*k19*k6*x3*x2 + (-1)*k19*k7*x3*x9 + 1*k19*k9*x1/100)/k19),
  Eq(Derivative(x4, t), ((-1)*k19*k4*x1*x4 + 1*k19*k14*x7 + (-1)*k19*k15*x4 + (-2)*k19*k16*x4**2)/k19),
  Eq(Derivative(x5, t), (2*k19*k5*x1*x3 + 2*k19*k6*x3*x2 + (-1)*k19*k8*x5 + (-1)*k19*k10*x5)/k19),
  Eq(Derivative(x6, t), (1*k19*k4*x1*x4 + (-1)*k19*k11*x6 + 1*k19*k15*x4)/k19),
  Eq(Derivative(x7, t), (1*k19*k9*x1/100 + 1*k19*k10*x5 + (-1)*k19*k14*x7 + 1*k19*k15*x4)/k19),
  Eq(Derivative(x8, t), 0/k19),
  Eq(Derivative(x9, t), 0/k19) ]