Solutions by everydaycalculation.com
1st number: 1/5, 2nd number: 5 5/7
15 - 407 is -19335.
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Related: 2/5-40/7 1/5-80/7 1/10-40/7 1/5-40/14 3/5-40/7 1/15-40/7 1/5-40/21 1/25-40/7 1/5-40/35 7/5-40/7 1/35-40/7 1/5-40/49
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