Solutions by everydaycalculation.com
1st number: 1/5, 2nd number: 9 1/7
15 - 647 is -31335.
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Related: 2/5-64/7 1/10-64/7 1/5-64/14 3/5-64/7 1/15-64/7 1/5-64/21 1/25-64/7 1/5-64/35 7/5-64/7 1/35-64/7 1/5-64/49
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