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111=12n+3
We move all terms to the left:
111-(12n+3)=0
We get rid of parentheses
-12n-3+111=0
We add all the numbers together, and all the variables
-12n+108=0
We move all terms containing n to the left, all other terms to the right
-12n=-108
n=-108/-12
n=+9
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