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-18.7-s=23.8
We move all terms to the left:
-18.7-s-(23.8)=0
We add all the numbers together, and all the variables
-1s-42.5=0
We move all terms containing s to the left, all other terms to the right
-s=42.5
s=42.5/-1
s=-42+0.5/1
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