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27.9=-3s+51.9
We move all terms to the left:
27.9-(-3s+51.9)=0
We get rid of parentheses
3s-51.9+27.9=0
We add all the numbers together, and all the variables
3s-24=0
We move all terms containing s to the left, all other terms to the right
3s=24
s=24/3
s=8
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