Solutions by everydaycalculation.com
1st number: 9/21, 2nd number: 7 1/9
921 - 649 is -42163.
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Related: 18/21-64/9 9/42-64/9 9/21-64/18 27/21-64/9 9/63-64/9 9/21-64/27 45/21-64/9 9/21-64/45 63/21-64/9 9/21-64/63
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