Solutions by everydaycalculation.com
1st number: 1 2/10, 2nd number: 1 3/12
1210 - 1512 is -120.
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Related: 24/10-15/12 12/10-30/12 12/20-15/12 12/10-15/24 36/10-15/12 12/10-45/12 12/30-15/12 12/10-15/36 60/10-15/12 12/10-75/12 12/50-15/12 12/10-15/60 84/10-15/12 12/70-15/12 12/10-15/84
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