Solutions by everydaycalculation.com
1st number: 12/20, 2nd number: 1 4/12
1220 - 1612 is -1115.
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Related: 24/20-16/12 12/20-32/12 12/40-16/12 12/20-16/24 36/20-16/12 12/20-48/12 12/60-16/12 12/20-16/36 60/20-16/12 12/20-80/12 12/20-16/60 84/20-16/12 12/20-16/84
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