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-s=3s+20
We move all terms to the left:
-s-(3s+20)=0
We add all the numbers together, and all the variables
-1s-(3s+20)=0
We get rid of parentheses
-1s-3s-20=0
We add all the numbers together, and all the variables
-4s-20=0
We move all terms containing s to the left, all other terms to the right
-4s=20
s=20/-4
s=-5
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