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3=s-4/2
We move all terms to the left:
3-(s-4/2)=0
We add all the numbers together, and all the variables
-(s-2)+3=0
We get rid of parentheses
-s+2+3=0
We add all the numbers together, and all the variables
-1s+5=0
We move all terms containing s to the left, all other terms to the right
-s=-5
s=-5/-1
s=+5
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