Solutions by everydaycalculation.com
1st number: 3/10, 2nd number: 1 5/10
310 - 1510 is -65.
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Related: 6/10-15/10 3/10-30/10 3/20-15/10 3/10-15/20 9/10-15/10 3/10-45/10 3/30-15/10 3/10-15/30 15/10-15/10 3/10-75/10 3/50-15/10 3/10-15/50 21/10-15/10 3/70-15/10 3/10-15/70
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