Solutions by everydaycalculation.com
78 - 712 is 724.
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Related: 14/8-7/12 7/8-14/12 7/16-7/12 7/8-7/24 21/8-7/12 7/8-21/12 7/24-7/12 7/8-7/36 35/8-7/12 7/8-35/12 7/40-7/12 7/8-7/60 49/8-7/12 7/8-49/12 7/56-7/12 7/8-7/84
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