\(\left(55-x\right)\left(2x-44\right)=0\)
⇒ \(\left[{}\begin{matrix}x=55\\x=22\end{matrix}\right.\)
\(\left[{}\begin{matrix}55-x=0\\2x-44=0\end{matrix}\right.\left[{}\begin{matrix}x=55\\x=22\end{matrix}\right.\)
\(\left(55-x\right)\left(2x-44\right)=0\\ \Rightarrow\left[{}\begin{matrix}5-x=0\\2x-44=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=5\\x=22\end{matrix}\right.\)
\(\left\{{}\begin{matrix}55-x=0\\2x-44=0\end{matrix}\right.\left\{{}\begin{matrix}x=55-0\\2x=44\end{matrix}\right.\left\{{}\begin{matrix}x=55\\x=44:2=22\end{matrix}\right.\)