84
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LCD(7, 5, 10) = 10
The LCD of any two (or more) of positive integers is 1
LCD(6, 7) = 42
If that's 5/12, 10/13 and 7/9, the LCD is 468.
56 is the lcd of 8 and 7. You can get this by multiplying 8x7. 8 and 7 have no common factors; that is why you multiply the two numbers to get the lcd.