-s+9=s-9

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Solution for -s+9=s-9 equation: 



-s+9=s-9

We move all terms to the left:

-s+9-(s-9)=0

We add all the numbers together, and all the variables

-1s-(s-9)+9=0

We get rid of parentheses

-1s-s+9+9=0

We add all the numbers together, and all the variables

-2s+18=0

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

-2s=-18

s=-18/-2

s=+9

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