Solutions by everydaycalculation.com
1st number: 1/3, 2nd number: 1 9/12
13 - 2112 is -1712.
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Related: 2/3-21/12 1/3-42/12 1/6-21/12 1/3-21/24 1/3-63/12 1/9-21/12 1/3-21/36 5/3-21/12 1/15-21/12 1/3-21/60 7/3-21/12 1/21-21/12 1/3-21/84
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