26-|x+9|=-13
⇔|x+9|=26-(-13)
⇔|x+9|=39
⇔\(\left[ \begin{array}{l}x+9=39\\x+9=-39\end{array} \right.\)⇔\(\left[ \begin{array}{l}x=30\\x=-48\end{array} \right.\)
Vậy x=30; x=-48
5.|x-4|=25
⇔|x-4|=5
⇔\(\left[ \begin{array}{l}x-4=5\\x-4=-5\end{array} \right.\)⇔\(\left[ \begin{array}{l}x=9\\x=-1\end{array} \right.\)
Vậy x=9; x=-1
3.|3-x|=12
⇔|3-x|=4
⇔\(\left[ \begin{array}{l}3-x=4\\3-x=-4\end{array} \right.\)⇔\(\left[ \begin{array}{l}x=-1\\x=7\end{array} \right.\)
Vậy x=-1; x=7.
