Solutions by everydaycalculation.com
1st number: 16/21, 2nd number: 1 3/12
1621 - 1512 is -4184.
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Related: 32/21-15/12 16/21-30/12 16/42-15/12 16/21-15/24 48/21-15/12 16/21-45/12 16/63-15/12 16/21-15/36 80/21-15/12 16/21-75/12 16/21-15/60 16/21-15/84
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