Solutions by everydaycalculation.com
1st number: 10/15, 2nd number: 1 8/10
1015 - 1810 is -1715.
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Related: 20/15-18/10 10/15-36/10 10/30-18/10 10/15-18/20 30/15-18/10 10/15-54/10 10/45-18/10 10/15-18/30 50/15-18/10 10/15-90/10 10/75-18/10 10/15-18/50 70/15-18/10 10/15-18/70
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