-6а-(а-7b) = -6a-a+7b = -7a+7b = 7b-7a
7b-7a = 7(b-a) = 7*(-3) = –21
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-6а-(а-7b) = -6a-a+7b = -7a+7b = 7b-7a
7b-7a = 7(b-a) = 7*(-3) = –21