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7n+12=13n-16=6n
We move all terms to the left:
7n+12-(13n-16)=0
We get rid of parentheses
7n-13n+16+12=0
We add all the numbers together, and all the variables
-6n+28=0
We move all terms containing n to the left, all other terms to the right
-6n=-28
n=-28/-6
n=4+2/3
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