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Anonymous
19 is prime, so multiply 19 by 112.
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LCM(6, 20, 19) = 1140
The LCD of 9/20 and 19/46 is 460.
A common denominator is 209, as is any multiple of 209.
The LCD of 7 and 77 is 77.
LCD(4, 9, 6, 20) = 180