Solutions by everydaycalculation.com
1st number: 1/21, 2nd number: 3 0/7
121 - 217 is -6221.
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Related: 2/21-21/7 1/21-42/7 1/42-21/7 1/21-21/14 3/21-21/7 1/21-63/7 1/63-21/7 5/21-21/7 1/21-21/35 7/21-21/7 1/21-21/49
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