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