Solutions by everydaycalculation.com
1st number: 10/15, 2nd number: 1 2/4
1015 - 64 is -56.
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Related: 20/15-6/4 10/15-12/4 10/30-6/4 10/15-6/8 30/15-6/4 10/15-18/4 10/45-6/4 10/15-6/12 50/15-6/4 10/15-30/4 10/75-6/4 10/15-6/20 70/15-6/4 10/15-42/4 10/15-6/28
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