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