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3(3s+1)=12
We move all terms to the left:
3(3s+1)-(12)=0
We multiply parentheses
9s+3-12=0
We add all the numbers together, and all the variables
9s-9=0
We move all terms containing s to the left, all other terms to the right
9s=9
s=9/9
s=1
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