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-3n-15=3n-27
We move all terms to the left:
-3n-15-(3n-27)=0
We get rid of parentheses
-3n-3n+27-15=0
We add all the numbers together, and all the variables
-6n+12=0
We move all terms containing n to the left, all other terms to the right
-6n=-12
n=-12/-6
n=+2
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