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Anonymous
5/7 of 21 = 21*5/7 = 15
Wiki User
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15/21 - 14/21 = 1/21
negative ten sevenths
4/3 minus 5/7 = 13/21
Four sevenths of 21 is 12.
5/7 + 1/3 = 15/21 + 7/21 = 22/21 = 1 1/21