Solutions by everydaycalculation.com
1st number: 18/20, 2nd number: 4 4/20
1820 - 8420 is -3310.
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Related: 36/20-84/20 18/40-84/20 18/20-84/40 54/20-84/20 18/60-84/20 18/20-84/60 90/20-84/20
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