18=9+3n

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Solution for 18=9+3n equation: 



18=9+3n

We move all terms to the left:

18-(9+3n)=0

We add all the numbers together, and all the variables

-(3n+9)+18=0

We get rid of parentheses

-3n-9+18=0

We add all the numbers together, and all the variables

-3n+9=0

We move all terms containing n to the left, all other terms to the right

-3n=-9

n=-9/-3

n=+3

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