Solutions by everydaycalculation.com
1st number: 4/21, 2nd number: 1 3/12
421 - 1512 is -8984.
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Related: 8/21-15/12 4/21-30/12 4/42-15/12 4/21-15/24 12/21-15/12 4/21-45/12 4/63-15/12 4/21-15/36 20/21-15/12 4/21-75/12 4/21-15/60 28/21-15/12 4/21-15/84
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