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(18+s)=31.50
We move all terms to the left:
(18+s)-(31.50)=0
We add all the numbers together, and all the variables
(s+18)-(31.5)=0
We add all the numbers together, and all the variables
(s+18)-31.5=0
We get rid of parentheses
s+18-31.5=0
We add all the numbers together, and all the variables
s-13.5=0
We move all terms containing s to the left, all other terms to the right
s=13.5
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