Ta có: \(\left|2x+1\right|< 3x\)
\(\Leftrightarrow\left\{{}\begin{matrix}2x+1>-3x\\2x+1< 3x\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}5x>-1\\-x+1< 0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x>\frac{1}{5}\\x>1\end{matrix}\right.\Leftrightarrow x>1\)
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