Solutions by everydaycalculation.com
1st number: 15/20, 2nd number: 1 4/20
1520 - 2420 is -920.
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Related: 30/20-24/20 15/20-48/20 15/40-24/20 15/20-24/40 45/20-24/20 15/20-72/20 15/60-24/20 15/20-24/60 75/20-24/20
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