Giải thích các bước giải:
`a) |x - 7|= 6`
`=>`\(\left[ \begin{array}{l}x-7=6\\x-7=-6\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=6+7\\x=-6+7\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=13\\x=1\end{array} \right.\)
`b) 2|x - 3|= 24`
`=>|x-3|=24:2`
`=>|x-3|=12`
`=>`\(\left[ \begin{array}{l}x-3=12\\x-3=-12\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=12+3\\x=-12+3\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=15\\x=-9\end{array} \right.\)
`c) - 3|x + 2|=( - 12)`
`=>|x+2|=(-12):(-3)`
`=>|x+2|=4`
`=>`\(\left[ \begin{array}{l}x+2=4\\x+2=-4\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=4-2\\x=-4-2\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=2\\x=-6\end{array} \right.\)
`d) |x + 1|= - (- 10)`
`=>|x+1|=10`
`=>`\(\left[ \begin{array}{l}x+1=10\\x+1=-10\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=10-1\\x=-10-1\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=9\\x=-11\end{array} \right.\)
