Solutions by everydaycalculation.com
1st number: 16/21, 2nd number: 2 2/7
1621 - 167 is -3221.
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Related: 32/21-16/7 16/21-32/7 16/42-16/7 16/21-16/14 48/21-16/7 16/21-48/7 16/63-16/7 16/21-16/21 80/21-16/7 16/21-80/7 16/21-16/35 16/21-16/49
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