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9(s-3)=12s
We move all terms to the left:
9(s-3)-(12s)=0
We add all the numbers together, and all the variables
-12s+9(s-3)=0
We multiply parentheses
-12s+9s-27=0
We add all the numbers together, and all the variables
-3s-27=0
We move all terms containing s to the left, all other terms to the right
-3s=27
s=27/-3
s=-9
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