Solutions by everydaycalculation.com
1st number: 9/21, 2nd number: 4 4/9
921 - 409 is -25363.
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Related: 18/21-40/9 9/21-80/9 9/42-40/9 9/21-40/18 27/21-40/9 9/63-40/9 9/21-40/27 45/21-40/9 9/21-40/45 63/21-40/9 9/21-40/63
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