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3s-11=4s-31
We move all terms to the left:
3s-11-(4s-31)=0
We get rid of parentheses
3s-4s+31-11=0
We add all the numbers together, and all the variables
-1s+20=0
We move all terms containing s to the left, all other terms to the right
-s=-20
s=-20/-1
s=+20
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