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0.9s=s+0.8
We move all terms to the left:
0.9s-(s+0.8)=0
We get rid of parentheses
0.9s-s-0.8=0
We add all the numbers together, and all the variables
-0.1s-0.8=0
We move all terms containing s to the left, all other terms to the right
-0.1s=0.8
s=0.8/-0.1
s=-8
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