15=9+3s

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Solution for 15=9+3s equation: 



15=9+3s

We move all terms to the left:

15-(9+3s)=0

We add all the numbers together, and all the variables

-(3s+9)+15=0

We get rid of parentheses

-3s-9+15=0

We add all the numbers together, and all the variables

-3s+6=0

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

-3s=-6

s=-6/-3

s=+2

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