Solutions by everydaycalculation.com
1st number: 4 0/3, 2nd number: 2 0/6
123 - 126 is 21.
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Related: 24/3-12/6 12/3-24/6 12/6-12/6 36/3-12/6 12/3-36/6 12/9-12/6 12/3-12/18 60/3-12/6 12/3-60/6 12/15-12/6 12/3-12/30 84/3-12/6 12/3-84/6 12/21-12/6 12/3-12/42
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