Solutions by everydaycalculation.com
1st number: 10 1/2, 2nd number: 21 1/3
212 - 643 is -656.
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Related: 42/2-64/3 21/4-64/3 21/2-64/6 63/2-64/3 21/6-64/3 21/2-64/9 21/10-64/3 21/2-64/15 21/14-64/3 21/2-64/21
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