[ Eq(Derivative(x1, t), (1*k29*k2*(x7 + k3)/(k4*(1 + (x3/k5)**k6) + x7 + k3) + (-1)*k29*k12*x1)/k29),
  Eq(Derivative(x2, t), (1*k29*k13*x1**k14 + (-1)*k29*k15*x2 + (-1)*k29*k16*x2 + 1*k28*k17*x3)/k29),
  Eq(Derivative(x3, t), (1*k29*k16*x2 + (-1)*k28*k17*x3 + (-1)*k28*k18*x3)/k28),
  Eq(Derivative(x4, t), (1*k29*k8*x3**k9/(k10**k9 + x3**k9) + (-1)*k29*k19*x4)/k29),
  Eq(Derivative(x5, t), (1*k29*k20*x4 + (-1)*k29*k21*x5 + (-1)*k29*k22*x5 + 1*k28*k23*x6)/k29),
  Eq(Derivative(x6, t), (1*k29*k22*x5 + (-1)*k28*k23*x6 + (-1)*k28*k24*x6 + (-1)*k28*k25*x6 + 1*k28*k26*x7)/k28),
  Eq(Derivative(x7, t), (1*k28*k25*x6 + (-1)*k28*k26*x7 + (-1)*k28*k27*x7)/k28) ]