Solutions by everydaycalculation.com
1st number: 3/20, 2nd number: 1 4/12
320 - 1612 is -7160.
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Related: 6/20-16/12 3/20-32/12 3/40-16/12 3/20-16/24 9/20-16/12 3/20-48/12 3/60-16/12 3/20-16/36 15/20-16/12 3/20-80/12 3/20-16/60 21/20-16/12 3/20-16/84
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