Solutions by everydaycalculation.com
1st number: 7/21, 2nd number: 4 2/7
721 - 307 is -8321.
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Related: 14/21-30/7 7/21-60/7 7/42-30/7 7/21-30/14 7/21-90/7 7/63-30/7 7/21-30/21 35/21-30/7 7/21-30/35 49/21-30/7 7/21-30/49
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