Solutions by everydaycalculation.com
1st number: 3/20, 2nd number: 4 0/10
320 - 4010 is -7720.
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Related: 6/20-40/10 3/20-80/10 3/40-40/10 3/20-40/20 9/20-40/10 3/60-40/10 3/20-40/30 15/20-40/10 3/20-40/50 21/20-40/10 3/20-40/70
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