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Select all equations that are equivalent to:
x² + 6x = 16
a. (x + 8) (x - 2) = 0
b. (x + 3)² = 25
c. x² + 6x + 9 = 16
d. x² + 6x + 9 = 0
e. x² + 6x16 = 0
f. (x + 3)2 = 16

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