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-20+7s=17s-13s
We move all terms to the left:
-20+7s-(17s-13s)=0
We add all the numbers together, and all the variables
7s-(+4s)-20=0
We get rid of parentheses
7s-4s-20=0
We add all the numbers together, and all the variables
3s-20=0
We move all terms containing s to the left, all other terms to the right
3s=20
s=20/3
s=6+2/3
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