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-20-12s=-19s+20+2s
We move all terms to the left:
-20-12s-(-19s+20+2s)=0
We add all the numbers together, and all the variables
-12s-(-17s+20)-20=0
We get rid of parentheses
-12s+17s-20-20=0
We add all the numbers together, and all the variables
5s-40=0
We move all terms containing s to the left, all other terms to the right
5s=40
s=40/5
s=8
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