Solutions by everydaycalculation.com
1st number: 7/10, 2nd number: 2 7/10
710 - 2710 is -21.
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Related: 14/10-27/10 7/10-54/10 7/20-27/10 7/10-27/20 21/10-27/10 7/10-81/10 7/30-27/10 7/10-27/30 35/10-27/10 7/50-27/10 7/10-27/50 49/10-27/10 7/70-27/10 7/10-27/70
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