Solutions by everydaycalculation.com
1st number: 7/20, 2nd number: 5 5/7
720 - 407 is -751140.
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Related: 14/20-40/7 7/20-80/7 7/40-40/7 7/20-40/14 21/20-40/7 7/60-40/7 7/20-40/21 35/20-40/7 7/20-40/35 49/20-40/7 7/20-40/49
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