Đáp án:
`8-5x+|3+15x|=0`
`<=>|3+15x|=5x-8`
Do `VT=|3+15x|>=0`
`=>VP=5x-8>=0
`<=>5x>=8`
`<=>x=8/5`
`|3+15x|=5x-8`
`<=>` \(\left[ \begin{array}{l}15x+3=5x-8\\15x+3=8-5x\end{array} \right.\)
`<=>` \(\left[ \begin{array}{l}10x=-11\\20x=5\end{array} \right.\)
`<=>` \(\left[ \begin{array}{l}x=-\dfrac{11}{10}(KTM)\\x=\dfrac{1}{4}(KTM)\end{array} \right.\)
Vậy phương trình vô nghiệm.