[ Eq(Derivative(x1, t), ((-1)*k10*k2*x1/(k1 + x1) + (-1)*k10*k4*x1/(k3 + x1) + (-1)*k10*k6*x1/(k5 + x1))/k10),
  Eq(Derivative(x2, t), (287/500*k10*k2*x1/(k1 + x1) + 751/1000*k10*k4*x1/(k3 + x1) + 17/250*k10*k6*x1/(k5 + x1) + (-1)*k10*k8*x2/(k7 + x2))/k10),
  Eq(Derivative(x3, t), (18/125*k10*k2*x1/(k1 + x1) + 23/1000*k10*k4*x1/(k3 + x1) + 59/1000*k10*k6*x1/(k5 + x1) + (-1)*k10*27/200*k8*x3/(k7 + x3))/k10),
  Eq(Derivative(x4, t), (1/20*k10*k2*x1/(k1 + x1) + 1/40*k10*k4*x1/(k3 + x1) + 17/125*k10*k6*x1/(k5 + x1))/k10),
  Eq(Derivative(x5, t), (3/250*k10*k2*x1/(k1 + x1) + 3/200*k10*k4*x1/(k3 + x1) + 107/1000*k10*k6*x1/(k5 + x1))/k10),
  Eq(Derivative(x6, t), (81/500*k10*k2*x1/(k1 + x1) + 127/1000*k10*k4*x1/(k3 + x1) + 109/500*k10*k6*x1/(k5 + x1))/k10),
  Eq(Derivative(x7, t), (1/25*k10*k2*x1/(k1 + x1) + 13/500*k10*k4*x1/(k3 + x1) + 109/500*k10*k6*x1/(k5 + x1))/k10),
  Eq(Derivative(x8, t), (7/500*k10*k2*x1/(k1 + x1) + 9/500*k10*k4*x1/(k3 + x1) + 49/500*k10*k6*x1/(k5 + x1))/k10),
  Eq(Derivative(x9, t), (1/250*k10*k2*x1/(k1 + x1) + 2/125*k10*k4*x1/(k3 + x1) + 97/1000*k10*k6*x1/(k5 + x1))/k10),
  Eq(Derivative(x10, t), (1*k10*k8*x2/(k7 + x2) + 1*k10*27/200*k8*x3/(k7 + x3))/k10) ]