Solutions by everydaycalculation.com
1st number: 4 0/4, 2nd number: 3/20
164 - 320 is 7720.
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Related: 32/4-3/20 16/4-6/20 16/8-3/20 16/4-3/40 48/4-3/20 16/4-9/20 16/12-3/20 16/4-3/60 80/4-3/20 16/4-15/20 16/20-3/20 16/4-21/20 16/28-3/20
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