Solutions by everydaycalculation.com
1st number: 3/20, 2nd number: 2 2/20
320 - 4220 is -3920.
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Related: 6/20-42/20 3/20-84/20 3/40-42/20 3/20-42/40 9/20-42/20 3/60-42/20 3/20-42/60 15/20-42/20 21/20-42/20
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