[ Eq(Derivative(x1, t), (1*k14*k5/(1 + k7*x2**k9)*x1*(2*k6/(1 + k8*x2**k10) - 1) + 1*k14*k11/(1 + k12*x1**k13)*x2)/k14),
  Eq(Derivative(x2, t), ((-1)*k14*k11/(1 + k12*x1**k13)*x2 + 1*k14*2*k5/(1 + k7*x2**k9)*x1*(1 - k6/(1 + k8*x2**k10)) + (-1)*k14*k1*x2)/k14) ]