Tìm x

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a) \( \sqrt{16x - 64} + \sqrt{9x - 36} + \sqrt{x - 4} = 16 \)

b) \( \sqrt{x^2 - 6x + 9} = 5 \)

c) \( \sqrt{x - 1} + \sqrt{9x - 9} - \sqrt{4x - 4} = 4 \)

d) \( \sqrt{4x^2 - 12x + 9} = 5 \)