{ diff(x1, t) = ((-1)*k17*x1*(1 - k6*(k16*k9/(1 + x6/k15) + k16*(1 - (k9 + k10)) + k16*k10)/k5)*k3 + (-1)*k17*x1*(1 - (1 - k6*(k16*k9/(1 + x6/k15) + k16*(1 - (k9 + k10)) + k16*k10)/k5)*k3))/k32,
  diff(x2, t) = ((-1)*k19*x2*k20 + (-1)*k19*x2*(1 - k20))/k32,
  diff(x3, t) = (-1)*k18*x3/k32,
  diff(x4, t) = (1*k17*x1*(1 - k6*(k16*k9/(1 + x6/k15) + k16*(1 - (k9 + k10)) + k16*k10)/k5)*k3 + (-1)*k16*k9/(1 + x6/k15)*x4 + (-1)*k16*k10*x4 + (-1)*k16*(1 - (k9 + k10))*x4)/k33,
  diff(x5, t) = (1*k16*k10*x4 + (-1)*k21*x5)/k34,
  diff(x6, t) = (1*k18*x3 + 1*k23/(1 - k23)*k22*x8 + (-1)*k24*x6 + (-1)*k26*(x6 - x7))/k37,
  diff(x7, t) = 1*k26*(x6 - x7)/k38,
  diff(x8, t) = (1*k19*x2*k20 + (-1)*k22*x8 + (-1)*k23/(1 - k23)*k22*x8 + (-1)*k25*(x8 - x9))/k35,
  diff(x9, t) = 1*k25*(x8 - x9)/k36 }