Solutions by everydaycalculation.com
1st number: 1 3/21, 2nd number: 3 1/21
2421 - 6421 is -4021.
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Related: 48/21-64/21 24/42-64/21 24/21-64/42 72/21-64/21 24/63-64/21 24/21-64/63
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