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You notice a very one-dimensional-thinking snail crawling along one rail of a railroad track. Naturally, you remove it to a safer place. But before you do, you observe it as it moves from position xi = -85.9 cm to position xf = -65.1 cm along the rail, as measured from a point where one rail abuts the next. What is the snail\'s displacement ?x in centimeters?

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