Solutions by everydaycalculation.com
1st number: 7/21, 2nd number: 5 5/7
721 - 407 is -11321.
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Related: 14/21-40/7 7/21-80/7 7/42-40/7 7/21-40/14 7/63-40/7 7/21-40/21 35/21-40/7 7/21-40/35 49/21-40/7 7/21-40/49
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