3 2*x - 15 ---------- 2 x + x + 6
(-15.0 + 2.0*x^3)/(6.0 + x + x^2)
3 -15 + 2*x ------------- 6 + x*(1 + x)
3 + 10*x -2 + 2*x - ---------- 2 6 + x + x