x + 4 ----------------- 1 / 2 \ \x + 18*x + 56/
4 + x -------------- 2 56 + x + 18*x
(4.0 + x)/(56.0 + x^2 + 18.0*x)
4 + x --------------- 56 + x*(18 + x)
1 ------ 14 + x