Solutions by everydaycalculation.com
1st number: 7 0/9, 2nd number: 4 4/9
639 - 409 is 239.
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Related: 63/9-80/9 63/18-40/9 63/9-40/18 63/27-40/9 63/9-40/27 63/45-40/9 63/9-40/45 63/9-40/63
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