Solutions by everydaycalculation.com
1st number: 1 3/21, 2nd number: 9/21
2421 - 921 is 57.
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Related: 48/21-9/21 24/21-18/21 24/42-9/21 24/21-9/42 72/21-9/21 24/21-27/21 24/63-9/21 24/21-9/63 24/21-45/21 24/21-63/21
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