There is none because 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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It is: 420
least common denominator for 15 and 10 is 30, so 9/15 = 18/30 and 7/10 = 21/30
40
The Least Common Denominator of 5, 7, and 35 is 1.
The least common denominator (LCD) is 40.