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LCD is the LCM of the denominator of a fraction.

For example
9/2,3/4, 5/6

You have to find the LCD above, to obtain the LCD, list down the multiples of each denominator:


The moment you saw that each of the numbers has a same number in their multiple, means that it is the LCM, which is 12. So it is considered as a LCD, because you find the LCM(same as LCD) of the denominator.