помогите пожалуйста
[tex]
\frac{6}{a-1} - \frac{10}{(a-1)^{2} }: \frac{10}{ a^{2} -1}- \frac{2a+2}{a-1}[/tex]
[tex]
\frac{6}{a-1} - \frac{10}{(a-1)^{2} }: \frac{10}{ a^{2} -1}- \frac{2a+2}{a-1}[/tex]
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Ответ: -3