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-12s-20=20-10s
We move all terms to the left:
-12s-20-(20-10s)=0
We add all the numbers together, and all the variables
-12s-(-10s+20)-20=0
We get rid of parentheses
-12s+10s-20-20=0
We add all the numbers together, and all the variables
-2s-40=0
We move all terms containing s to the left, all other terms to the right
-2s=40
s=40/-2
s=-20
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