Solutions by everydaycalculation.com
1st number: 12/15, 2nd number: 1 5/10
1215 - 1510 is -710.
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Related: 24/15-15/10 12/15-30/10 12/30-15/10 12/15-15/20 36/15-15/10 12/15-45/10 12/45-15/10 12/15-15/30 60/15-15/10 12/15-75/10 12/75-15/10 12/15-15/50 84/15-15/10 12/15-15/70
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