Ответ:
а)b+(4+b)=b+4+b=2b+4=2(b+2)
б)7а-(а-2х)=7а-а+2х=6а+2х=2(3а+х)
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Ответ:
а)b+(4+b)=b+4+b=2b+4=2(b+2)
б)7а-(а-2х)=7а-а+2х=6а+2х=2(3а+х)