Solutions by everydaycalculation.com
812 - 78 is -524.
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Related: 16/12-7/8 8/12-14/8 8/24-7/8 8/12-7/16 24/12-7/8 8/12-21/8 8/36-7/8 8/12-7/24 40/12-7/8 8/12-35/8 8/60-7/8 8/12-7/40 56/12-7/8 8/12-49/8 8/84-7/8 8/12-7/56
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