Solutions by everydaycalculation.com
1st number: 12/15, 2nd number: 2 11/12
1215 - 3512 is -12760.
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Related: 24/15-35/12 12/15-70/12 12/30-35/12 12/15-35/24 36/15-35/12 12/45-35/12 12/15-35/36 60/15-35/12 12/75-35/12 12/15-35/60 84/15-35/12 12/15-35/84
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