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n.n+7=8+n
We move all terms to the left:
n.n+7-(8+n)=0
We add all the numbers together, and all the variables
n.n-(n+8)+7=0
We get rid of parentheses
n.n-n-8+7=0
We add all the numbers together, and all the variables
-1n+n.n-1=0
We move all terms containing n to the left, all other terms to the right
-1n+n.n=1
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