Solutions by everydaycalculation.com
1st number: 7/12, 2nd number: 5 5/7
712 + 407 is 52984.
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Related: 14/12+40/7 7/12+80/7 7/24+40/7 7/12+40/14 21/12+40/7 7/36+40/7 7/12+40/21 35/12+40/7 7/60+40/7 7/12+40/35 49/12+40/7 7/84+40/7 7/12+40/49
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