15=3s+9

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Solution for 15=3s+9 equation: 



15=3s+9

We move all terms to the left:

15-(3s+9)=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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