Solutions by everydaycalculation.com
1st number: 5/15, 2nd number: 12 3/5
515 - 635 is -18415.
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Related: 10/15-63/5 5/30-63/5 5/15-63/10 5/45-63/5 5/15-63/15 25/15-63/5 5/75-63/5 5/15-63/25 35/15-63/5 5/15-63/35
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