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3.5=2s-5s
We move all terms to the left:
3.5-(2s-5s)=0
We add all the numbers together, and all the variables
-(-3s)+3.5=0
We get rid of parentheses
3s+3.5=0
We move all terms containing s to the left, all other terms to the right
3s=-3.5
s=-3.5/3
s=-1+0.5/3
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