3x + 12 + 4x2 - 3 is equivalent to 7x + 9.

What is the correct way for Erik to fix his error?

A) He should combine 12 and 3 to get 15.

B) He should combine 3x and 4x² to get 7x3.

C) He should not combine 3x and 4x?.

D) He should not combine 12 and 3.

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