Solutions by everydaycalculation.com
1st number: 3/20, 2nd number: 10 0/5
320 - 505 is -19720.
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Related: 6/20-50/5 3/40-50/5 3/20-50/10 9/20-50/5 3/60-50/5 3/20-50/15 15/20-50/5 3/20-50/25 21/20-50/5 3/20-50/35
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