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-20+5s-20=20-15s
We move all terms to the left:
-20+5s-20-(20-15s)=0
We add all the numbers together, and all the variables
5s-(-15s+20)-20-20=0
We add all the numbers together, and all the variables
5s-(-15s+20)-40=0
We get rid of parentheses
5s+15s-20-40=0
We add all the numbers together, and all the variables
20s-60=0
We move all terms containing s to the left, all other terms to the right
20s=60
s=60/20
s=3
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