2 x - 4 ------------ 2 5*x - x - 6
(-4.0 + x^2)/(-6.0 - x^2 + 5.0*x)
2 -4 + x -------------- -6 + x*(5 - x)
-(2 + x) --------- -3 + x
5 -1 - ------ -3 + x