Tim x, y biết:

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Bài 3 (2d): Tìm x biết Tim x, y biết:
a) \((3x+1)^2 = 9x^2 - 1\)
b) \(x^3 - 6x^2 + 12x - 8 = 0\)
c) \((x-1)^3 - (x+3)(x^2 - 3x + 9) + 3(x^2 - 4) = 2\)
d) \((x^3 - 27) - (3 - x)(6x + 9) = 0\)
e) \(x^3 - 7x - 6 = 0\)
f) \((x^2 - 4x) + 7(x^2 - 4x) + 12 = 0\)
h) \(x^2 + y^2 - 6x + 6y + 18 = 0\).