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The LCD is the LCM of all the denominators. The LCM of 13, 34, 532, and 89 is 10,463,908, which is the multiple of the highest power of prime factors from all of the given denominators (22 x 7 x 13 x 17 x 19 x 89 = 10463908). Prime factors of the denominators: 13=13; 34=2 x 17; 532 = 22 x 7 x 19; 89 = 89
LCD(7,9,13) = 7*9*13 which is 819
Since 13 is prime and 18=2*3*3, the LCD would be 2*3*3*13, or 234