21/18
3*7/3*6
factoring out the 3's, top and bottom we get,
7/6
------simplest form
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They are: 14/18 and 21/27
12 over 14. 18 over 21. 24 over 28
12/14 18/21 24/28
two fractions are equivalent 21 over 23 = 42/46, 63/69
6/7, 12/14