3(х+2)2-2х-4=0
(3х+6)2-2х-4=0
6х+12-2х-4=0
6х-2х+12-4=0
4х+8=0
4х=-8
х=-2
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3(х+2)2-2х-4=0
(3х+6)2-2х-4=0
6х+12-2х-4=0
6х-2х+12-4=0
4х+8=0
4х=-8
х=-2