Find the least common denominator (LCD).
, 
A. (10x - 9)(10x + 9)
B. 7x(3x + 20)
C. (10x - 9) or (10x + 9)
D. 7x(3x + 20)(10x - 9)(10x + 9)
Answer: A
Mathematics
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A. - 
, - 
B. - 
, - 
C. 
, 
D. 
, - 
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