[ Diff(x[1], t) = 0/k[13],
  Diff(x[2], t) = (1*k[13]*k[1]*x[2]*(1 - (x[2] + x[3])/k[3]) + (-1)*k[13]*(k[4] + (1/2 + x[1]^2/(5^2 + x[1]^2))*k[10]/(k[10] + x[5]^2))*x[2])/k[13],
  Diff(x[3], t) = (1*k[13]*k[2]*x[3]*(1 - (x[2] + x[3])/k[3]) + (-1)*k[13]*(k[4] + k[7]*x[4]^2/(k[8] + x[4]^2))*x[3])/k[13],
  Diff(x[4], t) = (1*k[13]*k[5]*x[2] + (-1)*k[13]*(k[11] + k[4])*x[4])/k[13],
  Diff(x[5], t) = (1*k[13]*(1/50 + 3/100*x[1]^2/(5^2 + x[1]^2))*x[3] + (-1)*k[13]*(k[12] + k[4])*x[5])/k[13],
  Diff(x[6], t) = 0,
  Diff(x[7], t) = 0 ]