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1600=400+.15s
We move all terms to the left:
1600-(400+.15s)=0
We add all the numbers together, and all the variables
-(.15s+400)+1600=0
We get rid of parentheses
-.15s-400+1600=0
We add all the numbers together, and all the variables
-0.15s+1200=0
We move all terms containing s to the left, all other terms to the right
-0.15s=-1200
s=-1200/-0.15
s=+8000
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