18=9n-3n

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Solution for 18=9n-3n equation: 



18=9n-3n

We move all terms to the left:

18-(9n-3n)=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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