18=9+3s

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Solution for 18=9+3s equation: 



18=9+3s

We move all terms to the left:

18-(9+3s)=0

We add all the numbers together, and all the variables

-(3s+9)+18=0

We get rid of parentheses

-3s-9+18=0

We add all the numbers together, and all the variables

-3s+9=0

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

-3s=-9

s=-9/-3

s=+3

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