Solutions by everydaycalculation.com
1st number: 7/12, 2nd number: 9 1/7
712 - 647 is -71984.
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Related: 14/12-64/7 7/24-64/7 7/12-64/14 21/12-64/7 7/36-64/7 7/12-64/21 35/12-64/7 7/60-64/7 7/12-64/35 49/12-64/7 7/84-64/7 7/12-64/49
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