{ diff(x1, t) = ((-1)*k28*((k10*k8 + k11*k7)/(k8 + k7*(1 + k8/k4))*k29*x1 - (k14 + k16*k7)/(1 + k7/k17)*x2) + (-1)*k28*((k3*k4 + k5)*k7/(k4 + k7*(1 + k4/k8))*x1 - (k30 + k31)*x3))/k28,
  diff(x2, t) = (1*k28*((k10*k8 + k11*k7)/(k8 + k7*(1 + k8/k4))*k29*x1 - (k14 + k16*k7)/(1 + k7/k17)*x2) + (-1)*k28*(k19*k17/(k17 + k7)*x2 - k32*x4) + (-1)*k28*((k21*k17 + k22)*k7/(k17 + k7)*x2 - k4*(k24 + k25)/(k4 + k7)*x5))/k28,
  diff(x3, t) = 1*k28*((k3*k4 + k5)*k7/(k4 + k7*(1 + k4/k8))*x1 - (k30 + k31)*x3)/k28,
  diff(x4, t) = 1*k28*(k19*k17/(k17 + k7)*x2 - k32*x4)/k28,
  diff(x5, t) = (1*k28*((k21*k17 + k22)*k7/(k17 + k7)*x2 - k4*(k24 + k25)/(k4 + k7)*x5) + (-1)*k28*((k3*k4 + k5)*k7/(k4 + k7)*x5 - (k33 + k34)*x6))/k28,
  diff(x6, t) = 1*k28*((k3*k4 + k5)*k7/(k4 + k7)*x5 - (k33 + k34)*x6)/k28 }