Solutions by everydaycalculation.com
1st number: 2 0/21, 2nd number: 1/21
4221 - 121 is 4121.
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Related: 84/21-1/21 42/21-2/21 42/21-1/42 42/21-3/21 42/63-1/21 42/21-1/63 42/21-5/21 42/21-7/21
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