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27=3n-12
We move all terms to the left:
27-(3n-12)=0
We get rid of parentheses
-3n+12+27=0
We add all the numbers together, and all the variables
-3n+39=0
We move all terms containing n to the left, all other terms to the right
-3n=-39
n=-39/-3
n=+13
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