Solutions by everydaycalculation.com
1st number: 10/15, 2nd number: 1 3/15
1015 - 1815 is -815.
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Related: 20/15-18/15 10/15-36/15 10/30-18/15 10/15-18/30 30/15-18/15 10/15-54/15 10/45-18/15 10/15-18/45 50/15-18/15 10/15-90/15 10/75-18/15 10/15-18/75 70/15-18/15
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