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-18n+18=-16n-12
We move all terms to the left:
-18n+18-(-16n-12)=0
We get rid of parentheses
-18n+16n+12+18=0
We add all the numbers together, and all the variables
-2n+30=0
We move all terms containing n to the left, all other terms to the right
-2n=-30
n=-30/-2
n=+15
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