\(\left|5-8x\right|\le11\) \(\Leftrightarrow\left|8x-5\right|\le11\)
\(\left[{}\begin{matrix}\left\{{}\begin{matrix}8x-5\ge0\Rightarrow x\ge\dfrac{5}{8}\\8x-5\le11\Rightarrow x\le2\end{matrix}\right.\\\left\{{}\begin{matrix}8x-5< 0\Rightarrow x< \dfrac{5}{8}\\-8x+5\le11\Rightarrow x\ge-\dfrac{3}{2}\end{matrix}\right.\end{matrix}\right.\)
Kết luận
\(-\dfrac{3}{4}\le x\le2\)