Solutions by everydaycalculation.com
1st number: 7 0/9, 2nd number: 7/9
639 - 79 is 569.
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Related: 63/9-14/9 63/18-7/9 63/9-7/18 63/9-21/9 63/27-7/9 63/9-7/27 63/9-35/9 63/45-7/9 63/9-7/45 63/9-49/9 63/9-7/63
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