Solutions by everydaycalculation.com
1st number: 1 2/3, 2nd number: 3/9
53 + 39 is 21.
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Related: 10/3+3/9 5/3+6/9 5/6+3/9 5/3+3/18 15/3+3/9 5/9+3/9 5/3+3/27 25/3+3/9 5/3+15/9 5/15+3/9 5/3+3/45 35/3+3/9 5/3+21/9 5/21+3/9 5/3+3/63
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