Solutions by everydaycalculation.com
712 - 67 is -2384.
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Related: 14/12-6/7 7/12-12/7 7/24-6/7 7/12-6/14 21/12-6/7 7/12-18/7 7/36-6/7 7/12-6/21 35/12-6/7 7/12-30/7 7/60-6/7 7/12-6/35 49/12-6/7 7/12-42/7 7/84-6/7 7/12-6/49
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