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39+6n=-n+4n
We move all terms to the left:
39+6n-(-n+4n)=0
We add all the numbers together, and all the variables
6n-(+3n)+39=0
We get rid of parentheses
6n-3n+39=0
We add all the numbers together, and all the variables
3n+39=0
We move all terms containing n to the left, all other terms to the right
3n=-39
n=-39/3
n=-13
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