Solutions by everydaycalculation.com
1st number: 10/15, 2nd number: 1 2/10
1015 - 1210 is -815.
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Related: 20/15-12/10 10/15-24/10 10/30-12/10 10/15-12/20 30/15-12/10 10/15-36/10 10/45-12/10 10/15-12/30 50/15-12/10 10/15-60/10 10/75-12/10 10/15-12/50 70/15-12/10 10/15-84/10 10/15-12/70
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