The least common denominator (LCD) is 1.
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lcd(21, 14, 26) = 546.
21 = 3 x 7
14 = 2 x 7
26 = 2 x 13
lcd = 2 x 3 x 7 x 13 = 546
546. They have a common factor of 2, then multiply that by the other factors: 2 x 3 x 7 x 13 = 546