Solutions by everydaycalculation.com
1st number: 7/20, 2nd number: 4 0/10
720 - 4010 is -7320.
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Related: 14/20-40/10 7/20-80/10 7/40-40/10 7/20-40/20 21/20-40/10 7/60-40/10 7/20-40/30 35/20-40/10 7/20-40/50 49/20-40/10 7/20-40/70
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