[latex] \frac{2x}{x-a} [/latex]-[latex] \frac{2x}{x+a} [/latex][latex] \frac{2-ab}{2a+ab}[/latex]+[latex] x-\frac{x ^{2} }{x+1} [/latex][latex] \frac{7}{ x^{2} - y^{2} } - \frac{2}{xy- x^{2} } - \frac{12}{ x^{2} +xy} [/latex][l...

[latex] \frac{2x}{x-a} [/latex]-[latex] \frac{2x}{x+a} [/latex] [latex] \frac{2-ab}{2a+ab}[/latex]+[latex]  x-\frac{x ^{2} }{x+1} [/latex] [latex] \frac{7}{ x^{2} - y^{2} } - \frac{2}{xy- x^{2} } - \frac{12}{ x^{2} +xy} [/latex] [latex] \frac{5}{(a+2 ) ^{2} } - \frac{5}{ a^{2}-4 } - \frac{5}{a+2} [/latex]