Solutions by everydaycalculation.com
1st number: 5 1/3, 2nd number: 2 2/7
163 - 167 is 6421.
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Related: 32/3-16/7 16/3-32/7 16/6-16/7 16/3-16/14 48/3-16/7 16/3-48/7 16/9-16/7 16/3-16/21 80/3-16/7 16/3-80/7 16/15-16/7 16/3-16/35 16/21-16/7 16/3-16/49
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