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