Solutions by everydaycalculation.com
1st number: 4/20, 2nd number: 1 10/20
420 - 3020 is -1310.
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Related: 8/20-30/20 4/20-60/20 4/40-30/20 4/20-30/40 12/20-30/20 4/20-90/20 4/60-30/20 4/20-30/60 28/20-30/20
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