Solutions by everydaycalculation.com
1st number: 1/21, 2nd number: 1 3/21
121 - 2421 is -2321.
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Related: 2/21-24/21 1/21-48/21 1/42-24/21 1/21-24/42 3/21-24/21 1/21-72/21 1/63-24/21 1/21-24/63 5/21-24/21 7/21-24/21
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