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5/7 - 5/21 = 15/21 - 5/21 = 10/21

5/7 - 5/21 = 15/21 - 5/21 = 10/21

5/7 - 5/21 = 15/21 - 5/21 = 10/21

5/7 - 5/21 = 15/21 - 5/21 = 10/21

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10y ago

5/7 - 5/21 = 15/21 - 5/21 = 10/21

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Q: What is 5 over 7 minus 5 over 21?
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