Ответ

Автор - Лотарингская
 dfrac{7}{ab} - dfrac{3a+6}{a} cdot dfrac{5}{a+2} = dfrac{7}{ab} - dfrac{3(a+2)}{a} cdot dfrac{5}{a+2}=dfrac{7}{ab}-dfrac{15}{a}=dfrac{7-15b}{ab}

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