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4.5(s+3)=45
We move all terms to the left:
4.5(s+3)-(45)=0
We multiply parentheses
4.5s+13.5-45=0
We add all the numbers together, and all the variables
4.5s-31.5=0
We move all terms containing s to the left, all other terms to the right
4.5s=31.5
s=31.5/4.5
s=7
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