а) 2(х+7)+у(7+х)=(х+7)(2+у)
б) 3а-3m-a+m=2a-2m=2(a-m)
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а) 2(х+7)+у(7+х)=(х+7)(2+у)
б) 3а-3m-a+m=2a-2m=2(a-m)