Solutions by everydaycalculation.com
1st number: 21/24, 2nd number: 4 1/12
2124 - 4912 is -7724.
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Related: 42/24-49/12 21/24-98/12 21/48-49/12 21/24-49/24 63/24-49/12 21/72-49/12 21/24-49/36 21/24-49/60 21/24-49/84
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