\(\left(2x-4\right)^6=\left(2x-4\right)^4\)
\(\left(2x-4\right)^6-\left(2x-4\right)^4=0\)
\(\left(2x-4\right)^4[\left(2x-4\right)^2-1]=0\)
\(\Rightarrow\orbr{\begin{cases}\left(2x-4\right)^4=0\\\left(2x-4\right)^2=1\end{cases}}\)
\(\Rightarrow x=2\text{hoặc}x=\frac{5}{2}\text{hoặc}x=\frac{3}{2}\)