Solutions by everydaycalculation.com
1st number: 16/21, 2nd number: 1 3/21
1621 - 2421 is -821.
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Related: 32/21-24/21 16/21-48/21 16/42-24/21 16/21-24/42 48/21-24/21 16/21-72/21 16/63-24/21 16/21-24/63 80/21-24/21
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