Solutions by everydaycalculation.com
1st number: 1 3/12, 2nd number: 1 9/12
1512 - 2112 is -12.
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Related: 30/12-21/12 15/12-42/12 15/24-21/12 15/12-21/24 45/12-21/12 15/12-63/12 15/36-21/12 15/12-21/36 75/12-21/12 15/60-21/12 15/12-21/60 15/84-21/12 15/12-21/84
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