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2s-16.5=4s-7.5
We move all terms to the left:
2s-16.5-(4s-7.5)=0
We get rid of parentheses
2s-4s+7.5-16.5=0
We add all the numbers together, and all the variables
-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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