Solutions by everydaycalculation.com
1st number: 18/21, 2nd number: 2 14/21
1821 - 5621 is -3821.
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Related: 36/21-56/21 18/42-56/21 18/21-56/42 54/21-56/21 18/63-56/21 18/21-56/63 90/21-56/21
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