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-20-20s=-8s-15s+16
We move all terms to the left:
-20-20s-(-8s-15s+16)=0
We add all the numbers together, and all the variables
-20s-(-23s+16)-20=0
We get rid of parentheses
-20s+23s-16-20=0
We add all the numbers together, and all the variables
3s-36=0
We move all terms containing s to the left, all other terms to the right
3s=36
s=36/3
s=12
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