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4n-40=-2n+2
We move all terms to the left:
4n-40-(-2n+2)=0
We get rid of parentheses
4n+2n-2-40=0
We add all the numbers together, and all the variables
6n-42=0
We move all terms containing n to the left, all other terms to the right
6n=42
n=42/6
n=7
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