Solutions by everydaycalculation.com
1st number: 7/12, 2nd number: 2 12/21
712 - 5421 is -16784.
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Related: 14/12-54/21 7/24-54/21 7/12-54/42 21/12-54/21 7/36-54/21 7/12-54/63 35/12-54/21 7/60-54/21 49/12-54/21 7/84-54/21
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