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3s=9s-30
We move all terms to the left:
3s-(9s-30)=0
We get rid of parentheses
3s-9s+30=0
We add all the numbers together, and all the variables
-6s+30=0
We move all terms containing s to the left, all other terms to the right
-6s=-30
s=-30/-6
s=+5
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