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2s+13=13s-42
We move all terms to the left:
2s+13-(13s-42)=0
We get rid of parentheses
2s-13s+42+13=0
We add all the numbers together, and all the variables
-11s+55=0
We move all terms containing s to the left, all other terms to the right
-11s=-55
s=-55/-11
s=+5
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