Solutions by everydaycalculation.com
1st number: 2/21, 2nd number: 9 0/7
221 - 637 is -18721.
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Related: 4/21-63/7 2/42-63/7 2/21-63/14 6/21-63/7 2/63-63/7 2/21-63/21 10/21-63/7 2/21-63/35 14/21-63/7 2/21-63/49
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