\[(x - 3)(x^{2} + 3x + 9) + x(x + 2)(2 - x) = 1\]

----- Nội dung ảnh -----
\[\circ\frac{(x - 3)(x^{2} + 3x + 9)}{1} + x(x + 2)(2 - x) = 1\]