4 3 x + 4*x - 2*x + 6 ------------------- x - 1
4 3 6 + x - 2*x + 4*x ------------------- -1 + x
(6.0 + x^4 + 4.0*x^3 - 2.0*x)/(-1.0 + x)
/ 2 \ 6 + x*\-2 + x *(4 + x)/ ----------------------- -1 + x
4 3 6 + x + 4*x - 2*x ------------------- -1 + x
3 2 9 3 + x + 5*x + 5*x + ------ -1 + x