There is none because the Least Common Denominator (or LCD) refers to the Least Common Multiple (LCM) of the denominators of two or more fractions or mixed numbers. Even if you converted your whole numbers (x) to their fraction equivalents (x/1), the LCD would always be 1.
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The LCM applies to whole numbers, not fractions. If you're trying to find the least common denominator, it's 12.
The LCD for the given three numbers is 60
As stated, this question does not appear to be particularly useful. The lowest common factor of the numbers is 1. The lowest common MULTIPLE of the three numbers, which could be of use, is 30.
3 * 7
The LCM of the given three numbers is 120