\(\left(x^4\right)^3=\dfrac{x^{18}}{x^7}\)
\(\Rightarrow x^{12}=x^{11}\)
\(\Rightarrow x^{12}-x^{11}=0\)
\(\Rightarrow x^{11}\left(x-1\right)=0\Rightarrow\left[{}\begin{matrix}x^{11}=0\Rightarrow x=0\\x-1=0\Rightarrow x=1\end{matrix}\right.\)
Mà đk x \(\ne\) 0 => x = 1
Vậy x = 1