Solutions by everydaycalculation.com
1st number: 21/24, 2nd number: 1 8/12
2124 - 2012 is -1924.
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Related: 42/24-20/12 21/24-40/12 21/48-20/12 21/24-20/24 63/24-20/12 21/24-60/12 21/72-20/12 21/24-20/36 21/24-20/60 21/24-20/84
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