Solutions by everydaycalculation.com
57 - 78 is -956.
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Related: 10/7-7/8 5/7-14/8 5/14-7/8 5/7-7/16 15/7-7/8 5/7-21/8 5/21-7/8 5/7-7/24 25/7-7/8 5/7-35/8 5/35-7/8 5/7-7/40 35/7-7/8 5/7-49/8 5/49-7/8 5/7-7/56
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