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Which expression is equivalent to (3x + 2 - 3y) (3x + 2 + 3y)?
A. 9x2 + 4 – 9y2
B. 9x2 + 4 +9y2
C. 9x2 + 12x + 4 – 9y2
D. 9x2 + 12x + 4 +9y2
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