x + 2 ----------------- 1 / 2 \ \x + 20*x + 36/
2 + x -------------- 2 36 + x + 20*x
(2.0 + x)/(36.0 + x^2 + 20.0*x)
2 + x --------------- 36 + x*(20 + x)
1 ------ 18 + x