|x-1|-3=4
x-1=4+3 hoặc x-1=(-4)+3
x-1=7 hoặc x-1=-1
x=7+1 hoặc x=(-1)+1
x=8 hoặc x=0
\(|x-1|-3=4\)
\(\Leftrightarrow|x-1|=4+3\)
\(\Leftrightarrow|x-1|=7\)
\(\Leftrightarrow\left[{}\begin{matrix}x-1=7\\x-1=-7\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=7+1\\x=-7+1\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=8\\x=-6\end{matrix}\right.\)
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