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-13n=4n-7
We move all terms to the left:
-13n-(4n-7)=0
We get rid of parentheses
-13n-4n+7=0
We add all the numbers together, and all the variables
-17n+7=0
We move all terms containing n to the left, all other terms to the right
-17n=-7
n=-7/-17
n=7/17
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