Solutions by everydaycalculation.com
1st number: 10 1/2, 2nd number: 10 4/6
212 - 646 is -16.
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Related: 42/2-64/6 21/4-64/6 21/2-64/12 63/2-64/6 21/6-64/6 21/2-64/18 21/10-64/6 21/2-64/30 21/14-64/6 21/2-64/42
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