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31.5=9s-9
We move all terms to the left:
31.5-(9s-9)=0
We get rid of parentheses
-9s+9+31.5=0
We add all the numbers together, and all the variables
-9s+40.5=0
We move all terms containing s to the left, all other terms to the right
-9s=-40.5
s=-40.5/-9
s=4+3/6
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