[ Diff(x[1], t) = (1*k[7]*1/16*x[1] + (-1)*k[7]*1/8*x[1]*x[2] + (-1)*k[7]*1/32*x[1]^2)/k[7],
  Diff(x[2], t) = (1*k[7]*1/32*x[2] + (-1)*k[7]*275/3200*x[1]*x[2] + (-1)*k[7]*1/32*x[2]^2)/k[7] ]