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