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n+(n+5)=15
We move all terms to the left:
n+(n+5)-(15)=0
We get rid of parentheses
n+n+5-15=0
We add all the numbers together, and all the variables
2n-10=0
We move all terms containing n to the left, all other terms to the right
2n=10
n=10/2
n=5
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