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81=9n-7
We move all terms to the left:
81-(9n-7)=0
We get rid of parentheses
-9n+7+81=0
We add all the numbers together, and all the variables
-9n+88=0
We move all terms containing n to the left, all other terms to the right
-9n=-88
n=-88/-9
n=9+7/9
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