Solutions by everydaycalculation.com
1st number: 12/15, 2nd number: 1 4/12
1215 - 1612 is -815.
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Related: 24/15-16/12 12/15-32/12 12/30-16/12 12/15-16/24 36/15-16/12 12/15-48/12 12/45-16/12 12/15-16/36 60/15-16/12 12/15-80/12 12/75-16/12 12/15-16/60 84/15-16/12 12/15-16/84
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