Solutions by everydaycalculation.com
1st number: 1/21, 2nd number: 1 9/12
121 - 2112 is -14384.
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Related: 2/21-21/12 1/21-42/12 1/42-21/12 1/21-21/24 3/21-21/12 1/21-63/12 1/63-21/12 1/21-21/36 5/21-21/12 1/21-21/60 7/21-21/12 1/21-21/84
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