Solutions by everydaycalculation.com
1st number: 7 0/9, 2nd number: 1 6/9
639 - 159 is 163.
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Related: 63/9-30/9 63/18-15/9 63/9-15/18 63/9-45/9 63/27-15/9 63/9-15/27 63/9-75/9 63/45-15/9 63/9-15/45 63/9-15/63
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