Solutions by everydaycalculation.com
1st number: 3/20, 2nd number: 16 0/4
320 - 644 is -31720.
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Related: 6/20-64/4 3/40-64/4 3/20-64/8 9/20-64/4 3/60-64/4 3/20-64/12 15/20-64/4 3/20-64/20 21/20-64/4 3/20-64/28
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