Solutions by everydaycalculation.com
1st number: 8/21, 2nd number: 1 19/21
821 - 4021 is -3221.
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Related: 16/21-40/21 8/21-80/21 8/42-40/21 8/21-40/42 24/21-40/21 8/63-40/21 8/21-40/63 40/21-40/21 56/21-40/21
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