Solutions by everydaycalculation.com
1st number: 12/15, 2nd number: 1 6/12
1215 - 1812 is -710.
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Related: 24/15-18/12 12/15-36/12 12/30-18/12 12/15-18/24 36/15-18/12 12/15-54/12 12/45-18/12 12/15-18/36 60/15-18/12 12/15-90/12 12/75-18/12 12/15-18/60 84/15-18/12 12/15-18/84
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