Ta có:
\(\left|4x\right|-\left|-13,5\right|=\left|2\frac{1}{4}\right|\)
\(\Rightarrow\left|4x\right|=\left|2\frac{1}{4}\right|+\left|-13,5\right|=2\frac{1}{4}+13,5=\frac{63}{4}\)
\(\Rightarrow\left[{}\begin{matrix}4x=\frac{63}{4}\\4x=-\frac{63}{4}\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=\frac{63}{16}\\x=\frac{-63}{16}\end{matrix}\right.\)