Solutions by everydaycalculation.com
1st number: 12/15, 2nd number: 1 3/12
1215 - 1512 is -920.
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Related: 24/15-15/12 12/15-30/12 12/30-15/12 12/15-15/24 36/15-15/12 12/15-45/12 12/45-15/12 12/15-15/36 60/15-15/12 12/15-75/12 12/75-15/12 12/15-15/60 84/15-15/12 12/15-15/84
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