[ Eq(Derivative(x1, t), (-1)*100*exp((-t)/90)/k5),
  Eq(Derivative(x2, t), ((-1)*k7*x1*x2/(k8 + x2) + 1*(k9*x7 - k10*x2))/k5),
  Eq(Derivative(x3, t), (1*k7*x1*x2/(k8 + x2) + (-1)*(k13*x3*x4 - k14*x5))/k5),
  Eq(Derivative(x4, t), (1*(k11*x9 - k12*x4) + (-1)*(k13*x3*x4 - k14*x5))/k5),
  Eq(Derivative(x5, t), (1*(k13*x3*x4 - k14*x5) + (-1)*k15*x5)/k5),
  Eq(Derivative(x6, t), (1*k15*x5 + (-1)*(k16*x6 - k17*x9*x8))/k6),
  Eq(Derivative(x7, t), ((-1)*(k9*x7 - k10*x2) + 1*k18*x8/(k19 + x8))/k6),
  Eq(Derivative(x8, t), (1*(k16*x6 - k17*x9*x8) + (-1)*k18*x8/(k19 + x8))/k6),
  Eq(Derivative(x9, t), ((-1)*(k11*x9 - k12*x4) + 1*(k16*x6 - k17*x9*x8))/k6),
  Eq(Derivative(x10, t), 1*k18*x8/(k19 + x8)/k6) ]