1 3*(x - 1) -- - --------- 3 4 x x
1 3 - 3*x -- + ------- 3 4 x x
1 -3 + 3*x -- - -------- 3 4 x x
x^(-3) - 3.0*(-1.0 + x)/x^4
4 3 x + x *(3 - 3*x) ----------------- 7 x
3 - 2*x ------- 4 x
-(-3 + 2*x) ------------ 4 x