Solutions by everydaycalculation.com
1st number: 3/20, 2nd number: 4 4/20
320 - 8420 is -8120.
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Related: 6/20-84/20 3/40-84/20 3/20-84/40 9/20-84/20 3/60-84/20 3/20-84/60 15/20-84/20 21/20-84/20
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