Solutions by everydaycalculation.com
1st number: 10/15, 2nd number: 2 4/6
1015 - 166 is -21.
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Related: 20/15-16/6 10/15-32/6 10/30-16/6 10/15-16/12 30/15-16/6 10/15-48/6 10/45-16/6 10/15-16/18 50/15-16/6 10/15-80/6 10/75-16/6 10/15-16/30 70/15-16/6 10/15-16/42
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