[ Eq(Derivative(x1, t), (1*k31*k1*k2*k3*k9/((1 + x8/k4)*(k10 + k9)*(k6 + k2)*(k5 + k3))/k31 + (-1)*k31*k7*x1*k8/((1 + x8/k4)*(k11 + x1)*(k29 + k8))/k31 + (-1)*k31*k30*x1/k31)/k31),
  Eq(Derivative(x2, t), (1*k31*k7*x1*k8/((1 + x8/k4)*(k11 + x1)*(k29 + k8))/k31 + (-1)*k31*k12*x2/(k13 + x2)/k31 + (-1)*k31*k30*x2/k31)/k31),
  Eq(Derivative(x3, t), (1*k31*k12*x2/(k13 + x2)/k31 + (-1)*k31*k14*x3/(k15 + x3)/k31 + (-1)*k31*k30*x3/k31)/k31),
  Eq(Derivative(x4, t), (1*k31*k14*x3/(k15 + x3)/k31 + (-1)*k31*k16*x4*k18/(k17 + x4*k18)/k31 + (-1)*k31*k30*x4/k31)/k31),
  Eq(Derivative(x5, t), (1*k31*k16*x4*k18/(k17 + x4*k18)/k31 + (-1)*k31*k19*x5/(k20 + x5)/k31 + (-1)*k31*k30*x5/k31)/k31),
  Eq(Derivative(x6, t), (1*k31*k19*x5/(k20 + x5)/k31 + (-1)*k31*k21*x6/(k22 + x6)/k31 + (-1)*k31*k30*x6/k31)/k31),
  Eq(Derivative(x7, t), (1*k31*k21*x6/(k22 + x6)/k31 + (-1)*k31*k23*x7/(k24 + x7)/k31 + (-1)*k31*k30*x7/k31)/k31),
  Eq(Derivative(x8, t), (1*k31*k23*x7/(k24 + x7)/k31 + (-1)*k31*k25*x8/(k26 + x8)/k31 + (-1)*k31*k27*x8/(k28 + x8)/k31 + (-1)*k31*k30*x8/k31)/k31),
  Eq(Derivative(x9, t), (1*k31*k27*x8/(k28 + x8)/k31 + (-1)*k31*k25*x9/(k26 + x9)/k31 + (-1)*k31*k30*x9/k31)/k31) ]