-7(3а-8)+5(6а-7) = -21а+56+30а-35=9а+21=9×3+21 = 27 + 21 = 48
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-7(3а-8)+5(6а-7) = -21а+56+30а-35=9а+21=9×3+21 = 27 + 21 = 48