1 4*x ----- + ------- x + 5 2 x - 25
1/(5.0 + x) + 4.0*x/(-25.0 + x^2)
2 -25 + x + 4*x*(5 + x) ---------------------- / 2\ \-25 + x /*(5 + x)
5*(-1 + x) ---------- 2 -25 + x
-5 + 5*x -------- 2 -25 + x
5*(-1 + x) ---------------- (-5 + x)*(5 + x)