Solutions by everydaycalculation.com
1st number: 12/20, 2nd number: 1 5/20
1220 - 2520 is -1320.
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Related: 24/20-25/20 12/20-50/20 12/40-25/20 12/20-25/40 36/20-25/20 12/20-75/20 12/60-25/20 12/20-25/60 60/20-25/20 84/20-25/20
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