\(\left(9x-36\right)\left(2x-10\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}9x-36=0\\2x-10=0\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}9x=36\\2x=10\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=4\\x=5\end{matrix}\right.\)
Vậy \(x\in\left\{4;5\right\}\)