Add and simplify the expression
\frac{2}{x-1}-\frac{2x}{x^{2}-1}
Graph
f(x)=\frac{2}{x-1}-\frac{2x}{x^{2}-1}
(level 1/2) Solve for
\frac{x-6}{x+2}+\frac{15x-18}{x^{2}-2x-8}