Solutions by everydaycalculation.com
1st number: 1/28, 2nd number: 9 1/7
128 - 647 is -25528.
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Related: 2/28-64/7 1/56-64/7 1/28-64/14 3/28-64/7 1/84-64/7 1/28-64/21 5/28-64/7 1/28-64/35 7/28-64/7 1/28-64/49
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