Solutions by everydaycalculation.com
1st number: 8/21, 2nd number: 4 1/12
821 - 4912 is -31184.
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Related: 16/21-49/12 8/21-98/12 8/42-49/12 8/21-49/24 24/21-49/12 8/63-49/12 8/21-49/36 40/21-49/12 8/21-49/60 56/21-49/12 8/21-49/84
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