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