Solutions by everydaycalculation.com
13 is equivalent to 39
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Related: 2/3 and 3/9 1/3 and 6/9 1/6 and 3/9 1/3 and 3/18 1/9 and 3/9 1/3 and 3/27 5/3 and 3/9 1/3 and 15/9 1/15 and 3/9 1/3 and 3/45 7/3 and 3/9 1/3 and 21/9 1/21 and 3/9 1/3 and 3/63
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