Solutions by everydaycalculation.com
1st number: 3 3/9, 2nd number: 1 3/9
309 - 129 is 21.
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Related: 60/9-12/9 30/9-24/9 30/18-12/9 30/9-12/18 90/9-12/9 30/9-36/9 30/27-12/9 30/9-12/27 30/9-60/9 30/45-12/9 30/9-12/45 30/9-84/9 30/63-12/9 30/9-12/63
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