Solutions by everydaycalculation.com
1st number: 1/3, 2nd number: 3 4/7
13 - 257 is -6821.
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Related: 2/3-25/7 1/3-50/7 1/6-25/7 1/3-25/14 1/3-75/7 1/9-25/7 1/3-25/21 5/3-25/7 1/15-25/7 1/3-25/35 7/3-25/7 1/21-25/7 1/3-25/49
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