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n.n/6=12
We move all terms to the left:
n.n/6-(12)=0
We multiply all the terms by the denominator
n.n-12*6=0
We add all the numbers together, and all the variables
n.n-72=0
We move all terms containing n to the left, all other terms to the right
n.n=72
n=72/1
n=72
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