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39=13n-4n
We move all terms to the left:
39-(13n-4n)=0
We add all the numbers together, and all the variables
-(+9n)+39=0
We get rid of parentheses
-9n+39=0
We move all terms containing n to the left, all other terms to the right
-9n=-39
n=-39/-9
n=4+1/3
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