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