[tex] \frac{a+b}{a}+ \frac{a-b}{b}+2=0 \ \textless \ =\ \textgreater \ ab+b^2+a^2-ab+2ab=0 \\ a^2+2ab+b^2=0 \ \textless \ =\ \textgreater \ (a+b)^2=0 =\ \textgreater \ a+b=0 =\ \textgreater \ \ \textgreater \ a=-b [/tex]
La inceput am adus fractiile la acelasi numitor (ab)si totodata am eliminat numitorul.
