Solutions by everydaycalculation.com
1st number: 16/21, 2nd number: 1 6/21
1621 - 2721 is -1121.
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Related: 32/21-27/21 16/21-54/21 16/42-27/21 16/21-27/42 48/21-27/21 16/21-81/21 16/63-27/21 16/21-27/63 80/21-27/21
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