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12=0.9s
We move all terms to the left:
12-(0.9s)=0
We add all the numbers together, and all the variables
-(+0.9s)+12=0
We get rid of parentheses
-0.9s+12=0
We move all terms containing s to the left, all other terms to the right
-0.9s=-12
s=-12/-0.9
s=13+0.3/0.9
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