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3s-7=s-1
We move all terms to the left:
3s-7-(s-1)=0
We get rid of parentheses
3s-s+1-7=0
We add all the numbers together, and all the variables
2s-6=0
We move all terms containing s to the left, all other terms to the right
2s=6
s=6/2
s=3
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