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331=7+6n
We move all terms to the left:
331-(7+6n)=0
We add all the numbers together, and all the variables
-(6n+7)+331=0
We get rid of parentheses
-6n-7+331=0
We add all the numbers together, and all the variables
-6n+324=0
We move all terms containing n to the left, all other terms to the right
-6n=-324
n=-324/-6
n=+54
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