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the LCD is the LCM (least common multiple) of the two number which is 105 in this case
21
The LCD of x, 5, 7, 15 is 105x.
15
147.
It is 42
LCD(21, 13, 14, 15) = 2730
It is: 105
20
LCD(49, 21) = 147
LCD(9, 21) = 63
LCD(18, 21) = 126
LCD(9, 15) = 45
LCD(15, 26) = 390
9 = 3^2 15 = 3 x 5 21 = 3 x 7 lcm = 3^2 x 5 x 7 = 315
LCD(15, 7, 8) = 840.