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n+(n-12)=40
We move all terms to the left:
n+(n-12)-(40)=0
We get rid of parentheses
n+n-12-40=0
We add all the numbers together, and all the variables
2n-52=0
We move all terms containing n to the left, all other terms to the right
2n=52
n=52/2
n=26
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