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2s-19=20-s
We move all terms to the left:
2s-19-(20-s)=0
We add all the numbers together, and all the variables
2s-(-1s+20)-19=0
We get rid of parentheses
2s+1s-20-19=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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