[ Diff(x[1], t) = 0,
  Diff(x[2], t) = (1*k[1]*k[2]/(1 + (x[3]/k[3])^k[4]) + (-1)*k[1]*k[8]*x[2])/k[1],
  Diff(x[3], t) = (1*k[1]*k[5]*delay(x[2], k[7])^k[6] + (-1)*k[1]*k[9]*x[3])/k[1] ]