Разность квадратов
(2х+7-2х)(2х+7+2х)=21
7(4х+7)=21
(4х+7)=3
4х=-4
х=-1.
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Разность квадратов
(2х+7-2х)(2х+7+2х)=21
7(4х+7)=21
(4х+7)=3
4х=-4
х=-1.