Solutions by everydaycalculation.com
1st number: 1 2/6, 2nd number: 12/18
86 + 1218 is 21.
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Related: 16/6+12/18 8/6+24/18 8/12+12/18 8/6+12/36 24/6+12/18 8/6+36/18 8/18+12/18 8/6+12/54 40/6+12/18 8/6+60/18 8/30+12/18 8/6+12/90 56/6+12/18 8/6+84/18 8/42+12/18
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