(2х+7)*-4х*=21
(2х+7) (2х+7)-4х*=21
4х*+28х+49-4х*=21
28х=21-49
28х=-28
х=-28/28
х=-1
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(2х+7)*-4х*=21
(2х+7) (2х+7)-4х*=21
4х*+28х+49-4х*=21
28х=21-49
28х=-28
х=-28/28
х=-1