Solutions by everydaycalculation.com
1st number: 3 3/9, 2nd number: 3/9
309 - 39 is 31.
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Related: 60/9-3/9 30/9-6/9 30/18-3/9 30/9-3/18 90/9-3/9 30/27-3/9 30/9-3/27 30/9-15/9 30/45-3/9 30/9-3/45 30/9-21/9 30/63-3/9 30/9-3/63
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