/ 2 \ (x - 1)*\x - 5*x + 6/ ---------------------- x - 3
(-1.0 + x)*(6.0 + x^2 - 5.0*x)/(-3.0 + x)
(-1 + x)*(6 + x*(-5 + x)) ------------------------- -3 + x
2 2 + x - 3*x
(-1 + x)*(-2 + x)