Solutions by everydaycalculation.com
1st number: 9/12, 2nd number: 1 4/21
912 - 2521 is -3784.
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Related: 18/12-25/21 9/12-50/21 9/24-25/21 9/12-25/42 27/12-25/21 9/12-75/21 9/36-25/21 9/12-25/63 45/12-25/21 9/60-25/21 63/12-25/21 9/84-25/21
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