Solutions by everydaycalculation.com
1st number: 1 1/20, 2nd number: 1 8/20
2120 - 2820 is -720.
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Related: 42/20-28/20 21/20-56/20 21/40-28/20 21/20-28/40 63/20-28/20 21/20-84/20 21/60-28/20 21/20-28/60
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