[ Eq(Derivative(x1, t), (1*k17*k1*x1*(1 - k2*x1) + (-1)*k17*(k3*x1*x3 + k4*x1*x2))/k17),
  Eq(Derivative(x2, t), (1*k17*(k5*x2*(1 - k6*x2) + k7*x1*x2) + (-1)*k17*k8*x2*x3)/k17),
  Eq(Derivative(x3, t), (1*k17*(k9 + k12*x1*x3/(k13 + x1) + k15*x2*x3/(k16 + x2)) + (-1)*k17*(k10*x3 + k11*x1*x3 + k14*x2*x3))/k17) ]