Solutions by everydaycalculation.com
47 - 78 is -1756.
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Related: 8/7-7/8 4/7-14/8 4/14-7/8 4/7-7/16 12/7-7/8 4/7-21/8 4/21-7/8 4/7-7/24 20/7-7/8 4/7-35/8 4/35-7/8 4/7-7/40 28/7-7/8 4/7-49/8 4/49-7/8 4/7-7/56
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