Solutions by everydaycalculation.com
1st number: 1 8/20, 2nd number: 3 15/20
2820 - 7520 is -4720.
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Related: 56/20-75/20 28/40-75/20 28/20-75/40 84/20-75/20 28/60-75/20 28/20-75/60
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