Tìm x: a) (x - 3)(x^2 + 3x + 9) + x(x + 2)(2 - x) = 1; b) (x + 1)^3 - (x - 1)^3 - 6(x - 1)^2 = -10; c) (x + 2)(x^2 - 2x + 4) - x(x^2 + 2) = 0

Tìm x:
a) (x - 3)(x² + 3x + 9) + x(x + 2)(2 - x) = 1
b) (x + 1)³ - (x - 1)³ - 6(x - 1)² = -10
c) (x + 2)(x² - 2x + 4) - x(x² + 2) = 0