Solutions by everydaycalculation.com
1st number: 3/10, 2nd number: 10 0/5
310 - 505 is -9710.
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Related: 6/10-50/5 3/20-50/5 3/10-50/10 9/10-50/5 3/30-50/5 3/10-50/15 15/10-50/5 3/50-50/5 3/10-50/25 21/10-50/5 3/70-50/5 3/10-50/35
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