Solutions by everydaycalculation.com
1st number: 18/20, 2nd number: 2 2/20
1820 - 4220 is -65.
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Related: 36/20-42/20 18/20-84/20 18/40-42/20 18/20-42/40 54/20-42/20 18/60-42/20 18/20-42/60 90/20-42/20
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