Solutions by everydaycalculation.com
1st number: 15/20, 2nd number: 4 2/10
1520 - 4210 is -6920.
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Related: 30/20-42/10 15/20-84/10 15/40-42/10 15/20-42/20 45/20-42/10 15/60-42/10 15/20-42/30 75/20-42/10 15/20-42/50 15/20-42/70
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