Solutions by everydaycalculation.com
1st number: 8 0/5, 2nd number: 3/10
405 - 310 is 7710.
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Related: 80/5-3/10 40/5-6/10 40/10-3/10 40/5-3/20 40/5-9/10 40/15-3/10 40/5-3/30 40/5-15/10 40/25-3/10 40/5-3/50 40/5-21/10 40/35-3/10 40/5-3/70
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