`|x-3|+5=3x` (giúp mình vs!)

Đáp án:

`|x -  3| + 5 = 3x`

`<=> |x - 3| = 3x - 5`

Do: `|x - 3| >= 0 AA x => 3x - 5 >= 0 => 3x >= 5 => x >= 5/3`

`<=>` \(\left[ \begin{array}{l}x - 3 = 3x - 5\\x - 3 = 5 - 3x\end{array} \right.\) 

`<=>` \(\left[ \begin{array}{l}x - 3x = -5 + 3\\x + 3x = 5 + 3\end{array} \right.\) 

`<=>` \(\left[ \begin{array}{l}-2x = -2\\4x = 8\end{array} \right.\) 

`<=>` \(\left[ \begin{array}{l}x = 1&(ktm)\\x = 2&(tm)\end{array} \right.\) 

 Vậy `S = {2}`

`#hana`