Solutions by everydaycalculation.com
1st number: 5/10, 2nd number: 2 5/10
510 - 2510 is -21.
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Related: 5/10-50/10 5/20-25/10 5/10-25/20 15/10-25/10 5/10-75/10 5/30-25/10 5/10-25/30 25/10-25/10 5/50-25/10 5/10-25/50 35/10-25/10 5/70-25/10 5/10-25/70
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