[ Eq(Derivative(x1, t), (1*k32*(1 - k25)*(k1*Piecewise((1, Le(t, k31)), (0, True)) + k2) + (-1)*k32*k3*x1)/k32),
  Eq(Derivative(x2, t), (1*k32*(1 - k25)*(k4*Piecewise((1, Le(t, k31)), (0, True)) + k5) + (-1)*k32*k6*x4*x2*(1 - k26) + (-1)*k32*k7*x2)/k32),
  Eq(Derivative(x3, t), (1*k32*k8*Piecewise((1, Le(t, k31)), (0, True)) + 1*k32*k9 + (-1)*k32*k10*x3)/k32),
  Eq(Derivative(x4, t), (1*k32*k11*Piecewise((1, Le(t, k31)), (0, True)) + 1*k32*k12 + (-1)*k32*k13*x4)/k32),
  Eq(Derivative(x5, t), (1*k32*k14*Piecewise((1, Le(t, k31)), (0, True))*x9 + 1*k32*Piecewise((0, Le(t, k31)), (k30, True))*(1 - Piecewise((1, Le(t, k31)), (0, True)))*x9 + (-1)*k32*k16*x4*(1 - k26)*x5 + (-1)*k32*k17*x5 + (-1)*k32*k18*x3*x5)/k32),
  Eq(Derivative(x6, t), (1*k32*k18*x3*x5 + (-1)*k32*k19*x4*(1 - k26)*x6 + (-1)*k32*k20*x6*x2)/k32),
  Eq(Derivative(x7, t), (1*k32*k16*x4*(1 - k26)*x5 + 1*k32*k19*x4*(1 - k26)*x6 + (-1)*k32*k21*x7 + (-1)*k32*k22*x1**2*x7)/k32),
  Eq(Derivative(x8, t), (1*k32*k22*x1**2*x7 + (-1)*k32*k23*x8)/k32),
  Eq(Derivative(x9, t), ((-1)*k32*k14*Piecewise((1, Le(t, k31)), (0, True))*x9 + (-1)*k32*Piecewise((0, Le(t, k31)), (k30, True))*(1 - Piecewise((1, Le(t, k31)), (0, True)))*x9 + 1*k32*k17*x5 + 1*k32*k20*x6*x2 + 1*k32*k21*x7 + 1*k32*k23*x8)/k32) ]