[ Eq(Derivative(x1, t), ((-2)*k15*(1/2*k2*x1**2 - k1*x2) + (-1)*k15*(k7*x1*x3 - k5*x5))/k15),
  Eq(Derivative(x2, t), 1*k15*(1/2*k2*x1**2 - k1*x2)/k15),
  Eq(Derivative(x3, t), ((-2)*k15*(1/2*k4*x3**2 - k3*x4) + (-1)*k15*(k7*x1*x3 - k5*x5))/k15),
  Eq(Derivative(x4, t), (1*k15*(1/2*k4*x3**2 - k3*x4) + (-1)*k15*k11*x4*x8 + 1*k15*k14*x10)/k15),
  Eq(Derivative(x5, t), (1*k15*(k7*x1*x3 - k5*x5) + (-1)*k15*k10*x5*x8 + 1*k15*k13*x9)/k15),
  Eq(Derivative(x6, t), (-2)*k15*(1/2*k8*x6**2 - k6*x7)/k15),
  Eq(Derivative(x7, t), (1*k15*(1/2*k8*x6**2 - k6*x7) + (-1)*k15*(k9*x7 - k12*x8))/k15),
  Eq(Derivative(x8, t), 1*k15*(k9*x7 - k12*x8)/k15),
  Eq(Derivative(x9, t), (1*k15*k10*x5*x8 + (-1)*k15*k13*x9)/k15),
  Eq(Derivative(x10, t), (1*k15*k11*x4*x8 + (-1)*k15*k14*x10)/k15) ]