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13.1=s/3+9
We move all terms to the left:
13.1-(s/3+9)=0
We get rid of parentheses
-s/3-9+13.1=0
We multiply all the terms by the denominator
-s-9*3+(13.1)*3=0
We add all the numbers together, and all the variables
-1s+12.3=0
We move all terms containing s to the left, all other terms to the right
-s=-12.3
s=-12.3/-1
s=12+0.3/1
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