Solutions by everydaycalculation.com
1st number: 4/21, 2nd number: 3 9/12
421 - 4512 is -29984.
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Related: 8/21-45/12 4/21-90/12 4/42-45/12 4/21-45/24 12/21-45/12 4/63-45/12 4/21-45/36 20/21-45/12 4/21-45/60 28/21-45/12 4/21-45/84
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