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9-s=s-9
We move all terms to the left:
9-s-(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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