Solutions by everydaycalculation.com
916 - 78 is -516.
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Related: 18/16-7/8 9/16-14/8 9/32-7/8 9/16-7/16 27/16-7/8 9/16-21/8 9/48-7/8 9/16-7/24 45/16-7/8 9/16-35/8 9/80-7/8 9/16-7/40 63/16-7/8 9/16-49/8 9/16-7/56
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