Solutions by everydaycalculation.com
1st number: 14 0/3, 2nd number: 5/12
423 + 512 is 17312.
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Related: 84/3+5/12 42/3+10/12 42/6+5/12 42/3+5/24 42/3+15/12 42/9+5/12 42/3+5/36 42/3+25/12 42/15+5/12 42/3+5/60 42/3+35/12 42/21+5/12 42/3+5/84
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