5 3 x - x
x^5 - x^3
(x + 1)*x*(x - 1)
((x + 1)*x)*(x - 1)
3 / 2\ x *\-1 + x /
x^3*(-1 + x^2)
3 x *(1 + x)*(-1 + x)
x^3*(1 + x)*(-1 + x)