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