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9=2s+
We move all terms to the left:
9-(2s+)=0
We add all the numbers together, and all the variables
-(+2s)+9=0
We get rid of parentheses
-2s+9=0
We move all terms containing s to the left, all other terms to the right
-2s=-9
s=-9/-2
s=4+1/2
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