Solutions by everydaycalculation.com
1st number: 1/21, 2nd number: 1 3/12
121 - 1512 is -10184.
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Related: 2/21-15/12 1/21-30/12 1/42-15/12 1/21-15/24 3/21-15/12 1/21-45/12 1/63-15/12 1/21-15/36 5/21-15/12 1/21-75/12 1/21-15/60 7/21-15/12 1/21-15/84
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