Solutions by everydaycalculation.com
1st number: 20/21, 2nd number: 1 3/21
2021 - 2421 is -421.
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Related: 40/21-24/21 20/21-48/21 20/42-24/21 20/21-24/42 60/21-24/21 20/21-72/21 20/63-24/21 20/21-24/63
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