Which one of the following is not a quadratic equation?
(A) (x + 2)2 = 2(x + 3)
(B) x2 + 3x = (–1) (1 – 3x)2
(C) (x + 2) (x – 1) = x2 – 2x – 3
(D) x3 – x2 + 2x + 1 = (x + 1)3
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