Solutions by everydaycalculation.com
1st number: 4/21, 2nd number: 3 3/6
421 - 216 is -13942.
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Related: 8/21-21/6 4/21-42/6 4/42-21/6 4/21-21/12 12/21-21/6 4/21-63/6 4/63-21/6 4/21-21/18 20/21-21/6 4/21-21/30 28/21-21/6 4/21-21/42
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