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-20+12s=19+13s-4s
We move all terms to the left:
-20+12s-(19+13s-4s)=0
We add all the numbers together, and all the variables
12s-(9s+19)-20=0
We get rid of parentheses
12s-9s-19-20=0
We add all the numbers together, and all the variables
3s-39=0
We move all terms containing s to the left, all other terms to the right
3s=39
s=39/3
s=13
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