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-3n=3n-18
We move all terms to the left:
-3n-(3n-18)=0
We get rid of parentheses
-3n-3n+18=0
We add all the numbers together, and all the variables
-6n+18=0
We move all terms containing n to the left, all other terms to the right
-6n=-18
n=-18/-6
n=+3
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