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-18=n+5n
We move all terms to the left:
-18-(n+5n)=0
We add all the numbers together, and all the variables
-(+6n)-18=0
We get rid of parentheses
-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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