{ diff(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,
  diff(x2, t) = 0,
  diff(x3, t) = 0,
  diff(x4, t) = 0,
  diff(x5, t) = 0,
  diff(x6, t) = 0,
  diff(x7, t) = 0/k1,
  diff(x8, t) = 0/k1,
  diff(x9, t) = 0/k1 }