Solutions by everydaycalculation.com
1st number: 9/21, 2nd number: 5 5/9
921 - 509 is -32363.
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Related: 18/21-50/9 9/42-50/9 9/21-50/18 27/21-50/9 9/63-50/9 9/21-50/27 45/21-50/9 9/21-50/45 63/21-50/9 9/21-50/63
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