[tex] \frac{2}{1- x^{2} } + \frac{x}{x-1} =2\ \textless \ =\ \textgreater \ \frac{2}{(1-x)(1+x)} - \frac{x}{1-x} =2[/tex]
[tex] 2-x(1+x)=2(1-x)(1+x)\ \textless \ =\ \textgreater \ 2-x- x^{2} =2-2 x^{2} [/tex]
[tex]-x=- x^{2} =\ \textgreater \ x=1[/tex]