a-5b=-7
a=5b-7
-7b-(3b-2(5b-7))
-7b-(3b-10b+14)
-7b-3b+10b-14
Ответ : -14
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a-5b=-7
a=5b-7
-7b-(3b-2(5b-7))
-7b-(3b-10b+14)
-7b-3b+10b-14
Ответ : -14