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A point is moving on the graph of xy = 21. When the point is at (7,3), its x-coordinate is increasing by 7 units

A point is moving on the graph of xy = 21. When the point is at (7,3), its x-coordinate is increasing by 7 units per second. How fast is the y-coordinate changing at that moment? The y-coordinate is (Simplify your answer.) at units per second.

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