Solutions by everydaycalculation.com
1st number: 4/21, 2nd number: 5 1/7
421 - 367 is -10421.
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Related: 8/21-36/7 4/21-72/7 4/42-36/7 4/21-36/14 12/21-36/7 4/63-36/7 4/21-36/21 20/21-36/7 4/21-36/35 28/21-36/7 4/21-36/49
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