2(х+3)=12
2х+6=12
2х=12-6
2х=6
х=6:2
х=3
x+3 = 12/2 = 6
x = 6 - 3 = 3
x = 3
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2(х+3)=12
2х+6=12
2х=12-6
2х=6
х=6:2
х=3
x+3 = 12/2 = 6
x = 6 - 3 = 3
x = 3