Solutions by everydaycalculation.com
1st number: 4/21, 2nd number: 6 0/7
421 - 427 is -12221.
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Related: 8/21-42/7 4/21-84/7 4/42-42/7 4/21-42/14 12/21-42/7 4/63-42/7 4/21-42/21 20/21-42/7 4/21-42/35 28/21-42/7 4/21-42/49
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