Solutions by everydaycalculation.com
1st number: 7/8, 2nd number: 1 1/7
78 - 87 is -1556.
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Related: 14/8-8/7 7/8-16/7 7/16-8/7 7/8-8/14 21/8-8/7 7/8-24/7 7/24-8/7 7/8-8/21 35/8-8/7 7/8-40/7 7/40-8/7 7/8-8/35 49/8-8/7 7/8-56/7 7/56-8/7 7/8-8/49
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