Solutions by everydaycalculation.com
1st number: 5/21, 2nd number: 10 3/6
521 - 636 is -43142.
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Related: 10/21-63/6 5/42-63/6 5/21-63/12 15/21-63/6 5/63-63/6 5/21-63/18 25/21-63/6 5/21-63/30 35/21-63/6 5/21-63/42
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