упрость -(4+3а)+(5а-7)
-(4+3а)+(5а-7)=-4-3а+5а-7=2а-11
-(4+3a)+(5a-7)=-4-3a+5a-7=-2a-11
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-(4+3а)+(5а-7)=-4-3а+5а-7=2а-11
-(4+3a)+(5a-7)=-4-3a+5a-7=-2a-11