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3=s/2+1
We move all terms to the left:
3-(s/2+1)=0
We get rid of parentheses
-s/2-1+3=0
We multiply all the terms by the denominator
-s-1*2+3*2=0
We add all the numbers together, and all the variables
-1s+4=0
We move all terms containing s to the left, all other terms to the right
-s=-4
s=-4/-1
s=+4
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