Solutions by everydaycalculation.com
1st number: 12/20, 2nd number: 1 3/12
1220 - 1512 is -1320.
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Related: 24/20-15/12 12/20-30/12 12/40-15/12 12/20-15/24 36/20-15/12 12/20-45/12 12/60-15/12 12/20-15/36 60/20-15/12 12/20-75/12 12/20-15/60 84/20-15/12 12/20-15/84
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