Đặt \(\left|x\right|=t\left(t\ge0\right)\). Ta có phương trình \(t^2-t=6\)
\(\Rightarrow t^2-t-6=0\Rightarrow t^2-3t+2t-6=0\)
\(\Rightarrow\left(t-3\right)\left(t+2\right)=0\Rightarrow\left[{}\begin{matrix}t=3\left(TM\right)\\t=-2\left(L\right)\end{matrix}\right.\)
\(\Rightarrow\left|x\right|=3\Rightarrow x=\pm3\)