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Taking out the highest common factor of 6x + 9 gives

A6(x + 3)
B3(x + 3)
C3(2x + 3)
D2(3x + 9)
Answer & Solution
Correct answer: C. 3(2x + 3)
The HCF of 6 and 9 is 3, and 3(2x + 3) = 6x + 9.
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