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-12s+1=-18s-20
We move all terms to the left:
-12s+1-(-18s-20)=0
We get rid of parentheses
-12s+18s+20+1=0
We add all the numbers together, and all the variables
6s+21=0
We move all terms containing s to the left, all other terms to the right
6s=-21
s=-21/6
s=-3+1/2
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