(x^3-x^2)/(x^2-x) - (1-x^2)/(x+1)=x^2(x-1)/[x(x-1)]+(x+1)(x-1)/(x+1)=x+x-1=2x-1
(x^3-x^2)/(x^2-x) - (1-x^2)/(x+1)=x-(1-x)=2x-1
=x(x^2-x)/(x^2-x) + (x^2-1)/(x+1)=x+x-1=2x-1
