Solutions by everydaycalculation.com
1st number: 4/21, 2nd number: 5 5/7
421 - 407 is -11621.
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Related: 8/21-40/7 4/21-80/7 4/42-40/7 4/21-40/14 12/21-40/7 4/63-40/7 4/21-40/21 20/21-40/7 4/21-40/35 28/21-40/7 4/21-40/49
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