a,\(x+5=\left|-18\right|\)
\(x+5=18\)
\(x=13\)
b,\(\left|-35\right|-x=\left|-5\right|\)
\(35-x=5\)
\(x=30\)
c,\(25-\left|x\right|=10\)
\(\left|x\right|=15\)
\(\Leftrightarrow\left[{}\begin{matrix}x=15\\x=-15\end{matrix}\right.\)
Vậy x=15 hoặc x=-15.
d,\(\left|x-2\right|+7=12\)
\(\left|x-2\right|=5\)
\(\Leftrightarrow\left[{}\begin{matrix}x-2=5\\x-2=-5\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=7\\x=-3\end{matrix}\right.\)
Vậy...
A.x+5=18
x=18-5
x=13
B.35-x=5
x=35-5
x=30
C,25-x=10
x=25-10
x=15
D.x=7
x-2=5