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n/3=12/4
We move all terms to the left:
n/3-(12/4)=0
We add all the numbers together, and all the variables
n/3-3=0
We multiply all the terms by the denominator
n-3*3=0
We add all the numbers together, and all the variables
n-9=0
We move all terms containing n to the left, all other terms to the right
n=9
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