Solutions by everydaycalculation.com
1st number: 12/21, 2nd number: 2 1/12
1221 - 2512 is -12784.
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Related: 24/21-25/12 12/21-50/12 12/42-25/12 12/21-25/24 36/21-25/12 12/21-75/12 12/63-25/12 12/21-25/36 60/21-25/12 12/21-25/60 84/21-25/12 12/21-25/84
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