Ответ:
3(x+7)-4x=2x-(8-x)
3x+21-4x=2x-8-x
3x-4x-2x+x=-21
2x=-21
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Ответ:
3(x+7)-4x=2x-(8-x)
3x+21-4x=2x-8-x
3x-4x-2x+x=-21
2x=-21