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n/3-12=3
We move all terms to the left:
n/3-12-(3)=0
We add all the numbers together, and all the variables
n/3-15=0
We multiply all the terms by the denominator
n-15*3=0
We add all the numbers together, and all the variables
n-45=0
We move all terms containing n to the left, all other terms to the right
n=45
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