The least common denominator (LCD) refers to a multiple that is COMMON to two or more ratios. You have only one ratio in the question! The least denominator for a ratio is its denominator: in this case, 12.
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5/12 is in its lowest terms.
It is: 12/32 = 3/8 in its lowest terms
84/144 = 7/12
There are an infinite number of them; one example is 11/16.
14/24 in lowest terms is 7/12. 5/60 in lowest terms is 1/12.