Solutions by everydaycalculation.com
1st number: 1 3/9, 2nd number: 8/12
129 + 812 is 21.
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Related: 24/9+8/12 12/9+16/12 12/18+8/12 12/9+8/24 36/9+8/12 12/9+24/12 12/27+8/12 12/9+8/36 60/9+8/12 12/9+40/12 12/45+8/12 12/9+8/60 84/9+8/12 12/9+56/12 12/63+8/12 12/9+8/84
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