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n/9+3=12
We move all terms to the left:
n/9+3-(12)=0
We add all the numbers together, and all the variables
n/9-9=0
We multiply all the terms by the denominator
n-9*9=0
We add all the numbers together, and all the variables
n-81=0
We move all terms containing n to the left, all other terms to the right
n=81
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