Solutions by everydaycalculation.com
1st number: 3/20, 2nd number: 3 4/7
320 - 257 is -479140.
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Related: 6/20-25/7 3/20-50/7 3/40-25/7 3/20-25/14 9/20-25/7 3/20-75/7 3/60-25/7 3/20-25/21 15/20-25/7 3/20-25/35 21/20-25/7 3/20-25/49
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