Solutions by everydaycalculation.com
78 - 79 is 772.
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Related: 14/8-7/9 7/8-14/9 7/16-7/9 7/8-7/18 21/8-7/9 7/8-21/9 7/24-7/9 7/8-7/27 35/8-7/9 7/8-35/9 7/40-7/9 7/8-7/45 49/8-7/9 7/8-49/9 7/56-7/9 7/8-7/63
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