Solutions by everydaycalculation.com
1st number: 12/20, 2nd number: 1 8/20
1220 - 2820 is -45.
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Related: 24/20-28/20 12/20-56/20 12/40-28/20 12/20-28/40 36/20-28/20 12/20-84/20 12/60-28/20 12/20-28/60 60/20-28/20 84/20-28/20
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