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