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3x^2 + 6x^2y + 9xy^2 =...

3`x^2` + 6`x^2`y + 9x`y^2` = ___

A

3x (x - 2y)

B

3 (2x + 3xy)

C

`(4z - 3)^2`

D

3x (x + 2xy + 3`y^2`)

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