Solutions by everydaycalculation.com
1st number: 5/21, 2nd number: 1 9/12
521 - 2112 is -12784.
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Related: 10/21-21/12 5/21-42/12 5/42-21/12 5/21-21/24 15/21-21/12 5/21-63/12 5/63-21/12 5/21-21/36 25/21-21/12 5/21-21/60 35/21-21/12 5/21-21/84
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