Solutions by everydaycalculation.com
1st number: 9/20, 2nd number: 4 4/20
920 - 8420 is -154.
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Related: 18/20-84/20 9/40-84/20 9/20-84/40 27/20-84/20 9/60-84/20 9/20-84/60 45/20-84/20 63/20-84/20
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