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s+s-23=s+42
We move all terms to the left:
s+s-23-(s+42)=0
We add all the numbers together, and all the variables
2s-(s+42)-23=0
We get rid of parentheses
2s-s-42-23=0
We add all the numbers together, and all the variables
s-65=0
We move all terms containing s to the left, all other terms to the right
s=65
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