Solutions by everydaycalculation.com
1st number: 1/21, 2nd number: 1 4/21
121 - 2521 is -87.
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Related: 2/21-25/21 1/21-50/21 1/42-25/21 1/21-25/42 3/21-25/21 1/21-75/21 1/63-25/21 1/21-25/63 5/21-25/21 7/21-25/21
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