Solutions by everydaycalculation.com
1st number: 16/21, 2nd number: 3 17/21
1621 - 8021 is -6421.
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Related: 32/21-80/21 16/42-80/21 16/21-80/42 48/21-80/21 16/63-80/21 16/21-80/63 80/21-80/21
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