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18.21=2s+4.55
We move all terms to the left:
18.21-(2s+4.55)=0
We get rid of parentheses
-2s-4.55+18.21=0
We add all the numbers together, and all the variables
-2s+13.66=0
We move all terms containing s to the left, all other terms to the right
-2s=-13.66
s=-13.66/-2
s=6+1/1.20481927711
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