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s-21+s-49=s+38
We move all terms to the left:
s-21+s-49-(s+38)=0
We add all the numbers together, and all the variables
2s-(s+38)-70=0
We get rid of parentheses
2s-s-38-70=0
We add all the numbers together, and all the variables
s-108=0
We move all terms containing s to the left, all other terms to the right
s=108
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