Solutions by everydaycalculation.com
1st number: 12/15, 2nd number: 2 1/12
1215 - 2512 is -7760.
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Related: 24/15-25/12 12/15-50/12 12/30-25/12 12/15-25/24 36/15-25/12 12/15-75/12 12/45-25/12 12/15-25/36 60/15-25/12 12/75-25/12 12/15-25/60 84/15-25/12 12/15-25/84
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