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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