Solutions by everydaycalculation.com
1st number: 8/21, 2nd number: 1 9/12
821 - 2112 is -11584.
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Related: 16/21-21/12 8/21-42/12 8/42-21/12 8/21-21/24 24/21-21/12 8/21-63/12 8/63-21/12 8/21-21/36 40/21-21/12 8/21-21/60 56/21-21/12 8/21-21/84
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