-2s=s-9

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Solution for -2s=s-9 equation: 



-2s=s-9

We move all terms to the left:

-2s-(s-9)=0

We get rid of parentheses

-2s-s+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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