Solutions by everydaycalculation.com
1st number: 28/30, 2nd number: 1 9/12
2830 - 2112 is -4960.
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Related: 56/30-21/12 28/30-42/12 28/60-21/12 28/30-21/24 84/30-21/12 28/30-63/12 28/90-21/12 28/30-21/36 28/30-21/60 28/30-21/84
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