Đáp án:
`a)x=-27`
`b)x=-4`
`c)` \(\left[ \begin{array}{l}x=6\\x=-6\end{array} \right.\)
`d)` \(\left[ \begin{array}{l}x=9\\x=-5\end{array} \right.\)
Giải thích các bước giải:
Ta có :
`a)x+4=-14-9`
`→x+4=-23`
`→x=-27`
`-------------`
`b)3x=-14+2`
`→3x=-12`
`→x=-4`
`--------------`
`c)2|x|=4-(-8)`
`→2|x|=12`
`→|x|=6`
`→` \(\left[ \begin{array}{l}x=6\\x=-6\end{array} \right.\)
`--------------`
`d)|x-2|=7`
`→` \(\left[ \begin{array}{l}x-2=7\\x-2=-7\end{array} \right.\)
`→` \(\left[ \begin{array}{l}x=9\\x=-5\end{array} \right.\)
