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