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5n-40=2n-13
We move all terms to the left:
5n-40-(2n-13)=0
We get rid of parentheses
5n-2n+13-40=0
We add all the numbers together, and all the variables
3n-27=0
We move all terms containing n to the left, all other terms to the right
3n=27
n=27/3
n=9
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