Ответ:
3(x-4) +4x=5x
3x-12+4x=5x
7x-12=5x
7x-5x=12
2x=12
x=12:2
x=6
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Ответ:
3(x-4) +4x=5x
3x-12+4x=5x
7x-12=5x
7x-5x=12
2x=12
x=12:2
x=6