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-15.5=-3s+8.5s
We move all terms to the left:
-15.5-(-3s+8.5s)=0
We add all the numbers together, and all the variables
-(+5.5s)-15.5=0
We get rid of parentheses
-5.5s-15.5=0
We move all terms containing s to the left, all other terms to the right
-5.5s=15.5
s=15.5/-5.5
s=-2+3/3.66666666667
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