[ Eq(Derivative(x1, t), (1*k1*k2 + (-1)*x8*k3/(1 + k4/k12)*x1/(x1 + k5*(1 + k11/k6)/(1 + k4/k12)) + (-1)*x9*(59/100000 + 31/500*x7**(29/10)/(32**(29/10) + x7**(29/10)))*x1/(1 + k11/k7))/k1),
  Eq(Derivative(x2, t), 0),
  Eq(Derivative(x3, t), 0),
  Eq(Derivative(x4, t), 0),
  Eq(Derivative(x5, t), 0),
  Eq(Derivative(x6, t), 0),
  Eq(Derivative(x7, t), 0/k1),
  Eq(Derivative(x8, t), 0/k1),
  Eq(Derivative(x9, t), 0/k1) ]