Solutions by everydaycalculation.com
1st number: 3 3/9, 2nd number: 4 6/9
309 - 429 is -43.
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Related: 60/9-42/9 30/9-84/9 30/18-42/9 30/9-42/18 90/9-42/9 30/27-42/9 30/9-42/27 30/45-42/9 30/9-42/45 30/63-42/9 30/9-42/63
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