119
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LCD = 119 (7x17=119)
The LCD is 1. The GCD is 17.
Since 11 and 17 are both prime, you multiply them together to get the LCD which comes out to be 187.
LCD(7,9,13) = 7*9*13 which is 819
The LCD of x, 5, 7, 15 is 105x.