Đáp án:
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`|5 (2x+3) | + |2 (2x+3) | + |2x+3|=16`
`-> 5 |2x+3| + 2 |2x+3| + 1 |2x+3|=16`
`-> (5+2+1) |2x+3| =1 6`
`-> 8 |2x+3|=16`
`-> |2x+3|=16÷ 8`
`-> |2x+3|=2`
`->` \(\left[ \begin{array}{l}2x+3=2\\2x+3=-2\end{array} \right.\)
`->` \(\left[ \begin{array}{l}2x=2-3\\2x=-2-3\end{array} \right.\)
`->` \(\left[ \begin{array}{l}2x=-1\\2x=-5\end{array} \right.\)
`->` \(\left[ \begin{array}{l}x=-1÷2\\x=-5÷2\end{array} \right.\)
`->` \(\left[ \begin{array}{l}x=\dfrac{-1}{2}\\x=\dfrac{-5}{2}\end{array} \right.\)
Vậy `x=(-1)/2` hoặc `x=(-5)/2`
