Solutions by everydaycalculation.com
1st number: 4/20, 2nd number: 2 2/20
420 - 4220 is -1910.
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Related: 8/20-42/20 4/20-84/20 4/40-42/20 4/20-42/40 12/20-42/20 4/60-42/20 4/20-42/60 28/20-42/20
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