Solutions by everydaycalculation.com
1st number: 4/20, 2nd number: 1 5/20
420 - 2520 is -2120.
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Related: 8/20-25/20 4/20-50/20 4/40-25/20 4/20-25/40 12/20-25/20 4/20-75/20 4/60-25/20 4/20-25/60 28/20-25/20
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