Solutions by everydaycalculation.com
1st number: 1 3/15, 2nd number: 1 13/15
1815 - 2815 is -23.
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Related: 36/15-28/15 18/15-56/15 18/30-28/15 18/15-28/30 54/15-28/15 18/15-84/15 18/45-28/15 18/15-28/45 90/15-28/15 18/75-28/15 18/15-28/75
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