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n/3+12=13
We move all terms to the left:
n/3+12-(13)=0
We add all the numbers together, and all the variables
n/3-1=0
We multiply all the terms by the denominator
n-1*3=0
We add all the numbers together, and all the variables
n-3=0
We move all terms containing n to the left, all other terms to the right
n=3
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