\(\Leftrightarrow\left|x-2\right|\left|x+2\right|-\left|x-2\right|=0\)
\(\Leftrightarrow\left|x-2\right|\left(\left|x+2\right|-1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}\left|x-2\right|=0\\\left|x+2\right|=1\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x-2=0\\x+2=1\\x+2=-1\end{matrix}\right.\)
\(\Leftrightarrow...\)