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3=s/3-4
We move all terms to the left:
3-(s/3-4)=0
We get rid of parentheses
-s/3+4+3=0
We multiply all the terms by the denominator
-s+4*3+3*3=0
We add all the numbers together, and all the variables
-1s+21=0
We move all terms containing s to the left, all other terms to the right
-s=-21
s=-21/-1
s=+21
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