[ Eq(Derivative(x1, t), (1*k14*x3*(k2*x2 + k4) + (-1)*k14*x3*k3*x1)/k14),
  Eq(Derivative(x2, t), (1*k14*(k13*k5/x3 + k13*k7) + (-1)*k14*k13*k6*x1)/k14),
  Eq(Derivative(x3, t), (1*k14*(k8*(x2 - k12)*(k11 - x3) + k9*x3*(k11 - x3)) + (-1)*k14*k10*x3)/k14) ]