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(7+n)=15
We move all terms to the left:
(7+n)-(15)=0
We add all the numbers together, and all the variables
(n+7)-15=0
We get rid of parentheses
n+7-15=0
We add all the numbers together, and all the variables
n-8=0
We move all terms containing n to the left, all other terms to the right
n=8
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