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20n=-7n-351
We move all terms to the left:
20n-(-7n-351)=0
We get rid of parentheses
20n+7n+351=0
We add all the numbers together, and all the variables
27n+351=0
We move all terms containing n to the left, all other terms to the right
27n=-351
n=-351/27
n=-13
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