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450+20s=75s+20s
We move all terms to the left:
450+20s-(75s+20s)=0
We add all the numbers together, and all the variables
20s-(+95s)+450=0
We get rid of parentheses
20s-95s+450=0
We add all the numbers together, and all the variables
-75s+450=0
We move all terms containing s to the left, all other terms to the right
-75s=-450
s=-450/-75
s=+6
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