Solutions by everydaycalculation.com
1st number: 12/15, 2nd number: 1 13/15
1215 - 2815 is -1615.
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Related: 24/15-28/15 12/15-56/15 12/30-28/15 12/15-28/30 36/15-28/15 12/15-84/15 12/45-28/15 12/15-28/45 60/15-28/15 12/75-28/15 12/15-28/75 84/15-28/15
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