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4.20=17.55-s
We move all terms to the left:
4.20-(17.55-s)=0
We add all the numbers together, and all the variables
-(-1s+17.55)+4.20=0
We add all the numbers together, and all the variables
-(-1s+17.55)+4.2=0
We get rid of parentheses
1s-17.55+4.2=0
We add all the numbers together, and all the variables
s-13.35=0
We move all terms containing s to the left, all other terms to the right
s=13.35
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