Solutions by everydaycalculation.com
1st number: 7/20, 2nd number: 1 15/20
720 - 3520 is -75.
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Related: 14/20-35/20 7/20-70/20 7/40-35/20 7/20-35/40 21/20-35/20 7/60-35/20 7/20-35/60 35/20-35/20 49/20-35/20
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