Solutions by everydaycalculation.com
1st number: 5/21, 2nd number: 2 3/12
521 - 2712 is -16984.
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Related: 10/21-27/12 5/21-54/12 5/42-27/12 5/21-27/24 15/21-27/12 5/21-81/12 5/63-27/12 5/21-27/36 25/21-27/12 5/21-27/60 35/21-27/12 5/21-27/84
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