Solutions by everydaycalculation.com
1st number: 9/21, 2nd number: 1 19/21
921 - 4021 is -3121.
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Related: 18/21-40/21 9/21-80/21 9/42-40/21 9/21-40/42 27/21-40/21 9/63-40/21 9/21-40/63 45/21-40/21 63/21-40/21
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