\( \begin{array}{l}9\left(x^{2}-2\right) \\ =9 x-18\end{array} \)

Step 1 ：\( 9(x^2 - 2) = 9x - 18 \)

Step 2 ：\( 9x^2 - 18 = 9x - 18 \)

Step 3 ：\( 9x^2 - 9x = 0 \)

Step 4 ：\( 9x(x - 1) = 0 \)