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3s=4s+9
We move all terms to the left:
3s-(4s+9)=0
We get rid of parentheses
3s-4s-9=0
We add all the numbers together, and all the variables
-1s-9=0
We move all terms containing s to the left, all other terms to the right
-s=9
s=9/-1
s=-9
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