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4s-1=2s-2
We move all terms to the left:
4s-1-(2s-2)=0
We get rid of parentheses
4s-2s+2-1=0
We add all the numbers together, and all the variables
2s+1=0
We move all terms containing s to the left, all other terms to the right
2s=-1
s=-1/2
s=-1/2
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