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12s+11=-20-19s
We move all terms to the left:
12s+11-(-20-19s)=0
We add all the numbers together, and all the variables
12s-(-19s-20)+11=0
We get rid of parentheses
12s+19s+20+11=0
We add all the numbers together, and all the variables
31s+31=0
We move all terms containing s to the left, all other terms to the right
31s=-31
s=-31/31
s=-1
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