2 2*x + 4*x + 2 -------------- 2*x - 1
(2.0 + 2.0*x^2 + 4.0*x)/(-1.0 + 2.0*x)
2*(1 + x*(2 + x)) ----------------- -1 + 2*x
5 9 - + x + -------- 2 -2 + 4*x
2 2*(1 + x) ---------- -1 + 2*x