a)x+5= 9
x=9-5
x=4
b) -3x=24
x=24:-3
x=-8
c) [x]-9=15
[x]=15+9
[x]=24
x=24
d)[x-9]=-2+17
[x-9]=15
[x]=15+9
[x]=24
x=24
a) \(x+5=-2+11\) b)\(-3x=5+29\)
\(\Rightarrow x=-2+11-5\) \(\Rightarrow-3x=24\)
\(\Rightarrow x=4\) \(\Rightarrow-8\)
c)\(\left|x\right|-9=-2+17\) d)\(\left|x-9\right|=-2+17\)
\(\left|x\right|=15+9\) \(\left|x-9\right|=15\)
\(\left|x\right|=24\) \(x-9=15\) hoặc \(x-9=15\)
x = 24 hoặc - 24 \(x=24\) hoặc \(x=-6\)