64-(Х+3)2=0
64-(х+3)2=0
64-2х-6=0
58-2х=0
-2х=-58
х=-58:(-2)
х=29
проверка: 64-(29+3)х2=64-64=0
64-6-2х=0
-2х=58
х=58:(-2)
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64-(х+3)2=0
64-2х-6=0
58-2х=0
-2х=-58
х=-58:(-2)
х=29
проверка: 64-(29+3)х2=64-64=0
64-(Х+3)2=0
64-6-2х=0
58-2х=0
-2х=58
х=58:(-2)
х=29