2 x - 4*x + 4 ------------ 2 5*x - 10*x
(4.0 + x^2 - 4.0*x)/(5.0*x^2 - 10.0*x)
4 + x*(-4 + x) -------------- 5*x*(-2 + x)
-2 + x ------ 5*x
1 2 - - --- 5 5*x