{ diff(x1, t) = ((-1)*k10*k2*x1/(k1 + x1) + (-1)*k10*k4*x1/(k3 + x1) + (-1)*k10*k6*x1/(k5 + x1))/k10,
  diff(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,
  diff(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,
  diff(x4, t) = (1/20*k10*k2*x1/(k1 + x1) + 1/40*k10*k4*x1/(k3 + x1) + 17/125*k10*k6*x1/(k5 + x1))/k10,
  diff(x5, t) = (3/250*k10*k2*x1/(k1 + x1) + 3/200*k10*k4*x1/(k3 + x1) + 107/1000*k10*k6*x1/(k5 + x1))/k10,
  diff(x6, t) = (81/500*k10*k2*x1/(k1 + x1) + 127/1000*k10*k4*x1/(k3 + x1) + 109/500*k10*k6*x1/(k5 + x1))/k10,
  diff(x7, t) = (1/25*k10*k2*x1/(k1 + x1) + 13/500*k10*k4*x1/(k3 + x1) + 109/500*k10*k6*x1/(k5 + x1))/k10,
  diff(x8, t) = (7/500*k10*k2*x1/(k1 + x1) + 9/500*k10*k4*x1/(k3 + x1) + 49/500*k10*k6*x1/(k5 + x1))/k10,
  diff(x9, t) = (1/250*k10*k2*x1/(k1 + x1) + 2/125*k10*k4*x1/(k3 + x1) + 97/1000*k10*k6*x1/(k5 + x1))/k10,
  diff(x10, t) = (1*k10*k8*x2/(k7 + x2) + 1*k10*27/200*k8*x3/(k7 + x3))/k10 }