Solutions by everydaycalculation.com
1st number: 5 1/3, 2nd number: 5/21
163 - 521 is 10721.
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Related: 32/3-5/21 16/3-10/21 16/6-5/21 16/3-5/42 48/3-5/21 16/3-15/21 16/9-5/21 16/3-5/63 80/3-5/21 16/3-25/21 16/15-5/21 16/3-35/21 16/21-5/21
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