Solutions by everydaycalculation.com
421 - 16 is 142.
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Related: 8/21-1/6 4/21-2/6 4/42-1/6 4/21-1/12 12/21-1/6 4/21-3/6 4/63-1/6 4/21-1/18 20/21-1/6 4/21-5/6 4/21-1/30 28/21-1/6 4/21-7/6 4/21-1/42
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