Solutions by everydaycalculation.com
1st number: 7/10, 2nd number: 4 2/10
710 - 4210 is -72.
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Related: 14/10-42/10 7/10-84/10 7/20-42/10 7/10-42/20 21/10-42/10 7/30-42/10 7/10-42/30 35/10-42/10 7/50-42/10 7/10-42/50 49/10-42/10 7/70-42/10 7/10-42/70
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