Solutions by everydaycalculation.com
1st number: 7/28, 2nd number: 5 5/7
728 - 407 is -15328.
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Related: 14/28-40/7 7/28-80/7 7/56-40/7 7/28-40/14 21/28-40/7 7/84-40/7 7/28-40/21 35/28-40/7 7/28-40/35 49/28-40/7 7/28-40/49
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