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I assume you mean 3x - 8 = 12 - x

if we move the x's to one side and the numbers to the other side:

3x - 8 + x = 12 - x + x

4x - 8 = 12

4x - 8 + 8= 12 +8

4x = 20

4x/4 = 20/4

x = 5

I hope that answers your question but if you would like further information please email me at charris321@wikianswers.com

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