Solutions by everydaycalculation.com
1st number: 3/12, 2nd number: 1 2/10
312 - 1210 is -1920.
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Related: 6/12-12/10 3/12-24/10 3/24-12/10 3/12-12/20 9/12-12/10 3/12-36/10 3/36-12/10 3/12-12/30 15/12-12/10 3/12-60/10 3/60-12/10 3/12-12/50 21/12-12/10 3/12-84/10 3/84-12/10 3/12-12/70
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