Solutions by everydaycalculation.com
1st number: 15/20, 2nd number: 1 10/20
1520 - 3020 is -34.
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Related: 30/20-30/20 15/20-60/20 15/40-30/20 15/20-30/40 45/20-30/20 15/20-90/20 15/60-30/20 15/20-30/60 75/20-30/20
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