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-20+16s=18s+20
We move all terms to the left:
-20+16s-(18s+20)=0
We get rid of parentheses
16s-18s-20-20=0
We add all the numbers together, and all the variables
-2s-40=0
We move all terms containing s to the left, all other terms to the right
-2s=40
s=40/-2
s=-20
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