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3x-74=x-12
We move all terms to the left:
3x-74-(x-12)=0
We get rid of parentheses
3x-x+12-74=0
We add all the numbers together, and all the variables
2x-62=0
We move all terms containing x to the left, all other terms to the right
2x=62
x=62/2
x=31
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