s+9=-2s

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Solution for s+9=-2s equation: 



s+9=-2s

We move all terms to the left:

s+9-(-2s)=0

We get rid of parentheses

s+2s+9=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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