Solutions by everydaycalculation.com
1st number: 3/20, 2nd number: 8 0/5
320 - 405 is -15720.
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Related: 6/20-40/5 3/20-80/5 3/40-40/5 3/20-40/10 9/20-40/5 3/60-40/5 3/20-40/15 15/20-40/5 3/20-40/25 21/20-40/5 3/20-40/35
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