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-6=15+7n
We move all terms to the left:
-6-(15+7n)=0
We add all the numbers together, and all the variables
-(7n+15)-6=0
We get rid of parentheses
-7n-15-6=0
We add all the numbers together, and all the variables
-7n-21=0
We move all terms containing n to the left, all other terms to the right
-7n=21
n=21/-7
n=-3
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