Solutions by everydaycalculation.com
1st number: 4 0/3, 2nd number: 5/21
123 - 521 is 7921.
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Related: 24/3-5/21 12/3-10/21 12/6-5/21 12/3-5/42 36/3-5/21 12/3-15/21 12/9-5/21 12/3-5/63 60/3-5/21 12/3-25/21 12/15-5/21 84/3-5/21 12/3-35/21 12/21-5/21
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