Solutions by everydaycalculation.com
1st number: 1/2, 2nd number: 10 4/6
12 - 646 is -616.
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Related: 1/4-64/6 1/2-64/12 3/2-64/6 1/6-64/6 1/2-64/18 5/2-64/6 1/10-64/6 1/2-64/30 7/2-64/6 1/14-64/6 1/2-64/42
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