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3x-40=x+2
We move all terms to the left:
3x-40-(x+2)=0
We get rid of parentheses
3x-x-2-40=0
We add all the numbers together, and all the variables
2x-42=0
We move all terms containing x to the left, all other terms to the right
2x=42
x=42/2
x=21
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