| 5x - 4 | = 2
<=> \(\hept{\begin{cases}5x-4=2\\5x-4=-2\end{cases}\Leftrightarrow\hept{\begin{cases}5x=6\\5x=2\end{cases}\Leftrightarrow}\hept{\begin{cases}x=\frac{6}{5}\\x=\frac{2}{5}\end{cases}}}\)\(\Leftrightarrow\hept{\begin{cases}x=1,2\\x=0,4\end{cases}}\)
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