a/ \(\left|x+1\right|-5=0\)
\(\Leftrightarrow\left|x+1\right|=5\)
\(\Leftrightarrow\left[{}\begin{matrix}x+1=5\\x+1=-5\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=4\\x=-6\end{matrix}\right.\)
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b/ \(\dfrac{x}{3}=\dfrac{6}{-9}\)
\(\Leftrightarrow\dfrac{x}{3}=\dfrac{-2}{3}\)
\(\Leftrightarrow x=-2\)
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