|-4:(-x)+3|=18
\(\left[ \begin{array}{l}-4:(-x)+3=18\\-4 :(-x)+3=-18\end{array} \right.\)
\(\left[ \begin{array}{l}-4:(-x)=15\\-4:(-x)=-21\end{array} \right.\)
\(\left[ \begin{array}{l}-x=-4:15\\-x=-4:(-21)\end{array} \right.\)
\(\left[ \begin{array}{l}-x=-4/15\\-x=4/21\end{array} \right.\)
\(\left[ \begin{array}{l}x=4/15\\x=-4/21\end{array} \right.\)
Vậy x = 4/15 hoặc x = -4/21
