Solutions by everydaycalculation.com
1st number: 16/21, 2nd number: 1 9/12
1621 - 2112 is -8384.
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Related: 32/21-21/12 16/21-42/12 16/42-21/12 16/21-21/24 48/21-21/12 16/21-63/12 16/63-21/12 16/21-21/36 80/21-21/12 16/21-21/60 16/21-21/84
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