Solutions by everydaycalculation.com
1st number: 2/21, 2nd number: 6 0/7
221 - 427 is -12421.
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Related: 4/21-42/7 2/21-84/7 2/42-42/7 2/21-42/14 6/21-42/7 2/63-42/7 2/21-42/21 10/21-42/7 2/21-42/35 14/21-42/7 2/21-42/49
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