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71=15+4n
We move all terms to the left:
71-(15+4n)=0
We add all the numbers together, and all the variables
-(4n+15)+71=0
We get rid of parentheses
-4n-15+71=0
We add all the numbers together, and all the variables
-4n+56=0
We move all terms containing n to the left, all other terms to the right
-4n=-56
n=-56/-4
n=+14
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