3*x
3*x - -----
x - 4
------------
6*x - 25
x - --------
x - 4 3*x
3*x - ------
-4 + x
------------
25 - 6*x
x + --------
-4 + x (3.0*x - 3.0*x/(-4.0 + x))/(x - (-25.0 + 6.0*x)/(-4.0 + x))
3*x*(-5 + x)
--------------
2
25 + x - 10*x3*x*(-5 + x) --------------------- 25 - 6*x + x*(-4 + x)