There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of two or more fractions. Even if you converted your numbers (x) to their fraction equivalents (x/1), the LCD would always be 1.
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The least common multiple of the numbers 14, 49, 63 and 84 is 1,764.
what is a common denominator for 6, 9 and 3
7
To determine if 3/7 is greater than 4/9, we need to find a common denominator. The least common multiple of 7 and 9 is 63. Converting 3/7 to have a denominator of 63 gives us 27/63, and converting 4/9 to have a denominator of 63 gives us 28/63. Comparing these fractions, we see that 28/63 (4/9) is indeed greater than 27/63 (3/7).
Using the least common denominator technique: 2/7 = 18/63. 5/9 = 35/63. 18/63 + 35/63 = 53/63. Because 53 is prime, this fraction cannot be reduced further.