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20=-6s+9s
We move all terms to the left:
20-(-6s+9s)=0
We add all the numbers together, and all the variables
-(+3s)+20=0
We get rid of parentheses
-3s+20=0
We move all terms containing s to the left, all other terms to the right
-3s=-20
s=-20/-3
s=6+2/3
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