Tìm x biết \( 3x^3 - 3x = 0 \)

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1) \( 3x^3 - 3x = 0 \)

2) \( x(x + 1) - x^2 + 1 = 0 \)

3) \( x(x - 2) + x - 2 = 0 \)

4) \( (3x - 1)(2x - 7) - (1 - 3x)(6x - 5) = 0 \)

5) \( (2x - 3)^2 - (x + 5)^2 = 0 \)

6) \( (2x^2 - 4x): 2x - (3x - 1)^2:(3x - 1) = 0 \)

7) \( (x + 4)^2 - (x - 1)(x + 1) = 16 \)

8) \( (2x - 1)^2 + (x + 3)^2 - 5(x + 7)(x - 7) = 0 \)