Solutions by everydaycalculation.com
728 - 67 is -1728.
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Related: 14/28-6/7 7/28-12/7 7/56-6/7 7/28-6/14 21/28-6/7 7/28-18/7 7/84-6/7 7/28-6/21 35/28-6/7 7/28-30/7 7/28-6/35 49/28-6/7 7/28-42/7 7/28-6/49
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