Solutions by everydaycalculation.com
1st number: 4/20, 2nd number: 1 15/20
420 - 3520 is -3120.
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Related: 8/20-35/20 4/20-70/20 4/40-35/20 4/20-35/40 12/20-35/20 4/60-35/20 4/20-35/60 28/20-35/20
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