Solutions by everydaycalculation.com
1st number: 4/15, 2nd number: 12 4/5
415 - 645 is -18815.
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Related: 8/15-64/5 4/30-64/5 4/15-64/10 12/15-64/5 4/45-64/5 4/15-64/15 20/15-64/5 4/75-64/5 4/15-64/25 28/15-64/5 4/15-64/35
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