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n.n/3=6
We move all terms to the left:
n.n/3-(6)=0
We multiply all the terms by the denominator
n.n-6*3=0
We add all the numbers together, and all the variables
n.n-18=0
We move all terms containing n to the left, all other terms to the right
n.n=18
n=18/1
n=18
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