3 x + 1 ------ 2 x - x
(1.0 + x^3)/(x^2 - x)
3 1 + x ---------- x*(-1 + x)
1 + x 1 + x + ------ 2 x - x
/ 2 \ (1 + x)*\1 + x - x/ -------------------- x*(-1 + x)