Solutions by everydaycalculation.com
1st number: 3/20, 2nd number: 12 4/5
320 - 645 is -25320.
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Related: 6/20-64/5 3/40-64/5 3/20-64/10 9/20-64/5 3/60-64/5 3/20-64/15 15/20-64/5 3/20-64/25 21/20-64/5 3/20-64/35
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