Solutions by everydaycalculation.com
1st number: 10/15, 2nd number: 1 6/10
1015 - 1610 is -1415.
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Related: 20/15-16/10 10/15-32/10 10/30-16/10 10/15-16/20 30/15-16/10 10/15-48/10 10/45-16/10 10/15-16/30 50/15-16/10 10/15-80/10 10/75-16/10 10/15-16/50 70/15-16/10 10/15-16/70
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