=>|4,5x|=2,5x+6
\(\Leftrightarrow\left[{}\begin{matrix}4,5x=2,5x+6\left(x>=0\right)\\-4,5x=2,5x+6\left(x< 0\right)\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\left(nhận\right)\\x=-\dfrac{6}{7}\left(nhận\right)\end{matrix}\right.\)
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