Solutions by everydaycalculation.com
1st number: 4 0/3, 2nd number: 5/12
123 - 512 is 4312.
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Related: 24/3-5/12 12/3-10/12 12/6-5/12 12/3-5/24 36/3-5/12 12/3-15/12 12/9-5/12 12/3-5/36 60/3-5/12 12/3-25/12 12/15-5/12 12/3-5/60 84/3-5/12 12/3-35/12 12/21-5/12 12/3-5/84
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