Solutions by everydaycalculation.com
1st number: 5/20, 2nd number: 4 2/10
520 - 4210 is -7920.
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Related: 10/20-42/10 5/20-84/10 5/40-42/10 5/20-42/20 15/20-42/10 5/60-42/10 5/20-42/30 25/20-42/10 5/20-42/50 35/20-42/10 5/20-42/70
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