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13n-16+7n+12+6n=345
We move all terms to the left:
13n-16+7n+12+6n-(345)=0
We add all the numbers together, and all the variables
26n-349=0
We move all terms containing n to the left, all other terms to the right
26n=349
n=349/26
n=13+11/26
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