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-13+6n=4n-7
We move all terms to the left:
-13+6n-(4n-7)=0
We get rid of parentheses
6n-4n+7-13=0
We add all the numbers together, and all the variables
2n-6=0
We move all terms containing n to the left, all other terms to the right
2n=6
n=6/2
n=3
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