Solutions by everydaycalculation.com
78 - 56 is 124.
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Related: 14/8-5/6 7/8-10/6 7/16-5/6 7/8-5/12 21/8-5/6 7/8-15/6 7/24-5/6 7/8-5/18 35/8-5/6 7/8-25/6 7/40-5/6 7/8-5/30 49/8-5/6 7/8-35/6 7/56-5/6 7/8-5/42
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