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-s-1=-2s+9
We move all terms to the left:
-s-1-(-2s+9)=0
We add all the numbers together, and all the variables
-1s-(-2s+9)-1=0
We get rid of parentheses
-1s+2s-9-1=0
We add all the numbers together, and all the variables
s-10=0
We move all terms containing s to the left, all other terms to the right
s=10
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