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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 LCM is 56.
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.
The only common factor of four and seven is one, because seven is a prime number.
3 * 7