Solutions by everydaycalculation.com
1st number: 10/15, 2nd number: 1 5/10
1015 - 1510 is -56.
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Related: 20/15-15/10 10/15-30/10 10/30-15/10 10/15-15/20 30/15-15/10 10/15-45/10 10/45-15/10 10/15-15/30 50/15-15/10 10/15-75/10 10/75-15/10 10/15-15/50 70/15-15/10 10/15-15/70
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