Solutions by everydaycalculation.com
1st number: 1/2, 2nd number: 3 4/7
12 - 257 is -4314.
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Related: 1/2-50/7 1/4-25/7 1/2-25/14 3/2-25/7 1/2-75/7 1/6-25/7 1/2-25/21 5/2-25/7 1/10-25/7 1/2-25/35 7/2-25/7 1/14-25/7 1/2-25/49
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