Solutions by everydaycalculation.com
1st number: 1/3, 2nd number: 1 3/12
13 - 1512 is -1112.
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Related: 2/3-15/12 1/3-30/12 1/6-15/12 1/3-15/24 1/3-45/12 1/9-15/12 1/3-15/36 5/3-15/12 1/3-75/12 1/15-15/12 1/3-15/60 7/3-15/12 1/21-15/12 1/3-15/84
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