Solutions by everydaycalculation.com
56 - 78 is -124.
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Related: 10/6-7/8 5/6-14/8 5/12-7/8 5/6-7/16 15/6-7/8 5/6-21/8 5/18-7/8 5/6-7/24 25/6-7/8 5/6-35/8 5/30-7/8 5/6-7/40 35/6-7/8 5/6-49/8 5/42-7/8 5/6-7/56
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