If x = 3a and y = 9b, then all of the following are equal to 2(x + y) EXCEPT【小站备考】

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Question 1 Select one or more answer choices

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If x = 3a and y = 9b, then all of the following are equal to 2(x + y) EXCEPT

A.2(3a) + 9b

B.12a + 9b

C.6a + 18b

D.6(a + 3b)

E.6a + 21b

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