2х+8=12
2х=12-8
2х=4
х=4:2
х=2
2(x+4)=12
2x+8=12
2x=12-8
2x=4
x=2
Ответ: 2
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2х+8=12
2х=12-8
2х=4
х=4:2
х=2
2(x+4)=12
2x+8=12
2x=12-8
2x=4
x=2
Ответ: 2