Solutions by everydaycalculation.com
1st number: 5/21, 2nd number: 3 9/12
521 - 4512 is -29584.
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Related: 10/21-45/12 5/21-90/12 5/42-45/12 5/21-45/24 15/21-45/12 5/63-45/12 5/21-45/36 25/21-45/12 5/21-45/60 35/21-45/12 5/21-45/84
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