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-20+13s=11s-16
We move all terms to the left:
-20+13s-(11s-16)=0
We get rid of parentheses
13s-11s+16-20=0
We add all the numbers together, and all the variables
2s-4=0
We move all terms containing s to the left, all other terms to the right
2s=4
s=4/2
s=2
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