Solutions by everydaycalculation.com
1st number: 2/3, 2nd number: 2 12/21
23 - 5421 is -4021.
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Related: 4/3-54/21 2/6-54/21 2/3-54/42 6/3-54/21 2/9-54/21 2/3-54/63 10/3-54/21 2/15-54/21 14/3-54/21 2/21-54/21
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