Solutions by everydaycalculation.com
1st number: 7/28, 2nd number: 1 1/7
728 - 87 is -2528.
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Related: 14/28-8/7 7/28-16/7 7/56-8/7 7/28-8/14 21/28-8/7 7/28-24/7 7/84-8/7 7/28-8/21 35/28-8/7 7/28-40/7 7/28-8/35 49/28-8/7 7/28-56/7 7/28-8/49
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