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84^2=n+6n+6-13
We move all terms to the left:
84^2-(n+6n+6-13)=0
We add all the numbers together, and all the variables
-(7n-7)+84^2=0
We add all the numbers together, and all the variables
-(7n-7)+7056=0
We get rid of parentheses
-7n+7+7056=0
We add all the numbers together, and all the variables
-7n+7063=0
We move all terms containing n to the left, all other terms to the right
-7n=-7063
n=-7063/-7
n=+1009
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