Solutions by everydaycalculation.com
1st number: 1/3, 2nd number: 3 6/7
13 - 277 is -7421.
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Related: 2/3-27/7 1/3-54/7 1/6-27/7 1/3-27/14 1/3-81/7 1/9-27/7 1/3-27/21 5/3-27/7 1/15-27/7 1/3-27/35 7/3-27/7 1/21-27/7 1/3-27/49
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