Đáp án:
Giải thích các bước giải:
a) <=> 311-x+82=46+x-21
<=> -2x=-368
<=> x=184
b)<=> -x-3+84=x+70-71-6
<=>-2x=-88
<=>x=44
c)<=> -574-x=x-12-741-23
<=>-2x=-202
<=>x=101
d)*<=> \(\left[ \begin{array}{l}x-7=24\\7-x=24\end{array} \right.\)
<=> \(\left[ \begin{array}{l}x=31\\x=-17\end{array} \right.\)
**<=> \(\left[ \begin{array}{l}x+8=-12\\-x-8=-12\end{array} \right.\)
<=> \(\left[ \begin{array}{l}x=-20\\x=4\end{array} \right.\)
***<=> \(\left[ \begin{array}{l}48-3x=0\\3x-48=0\end{array} \right.\)
<=> x=16
