\(a,x-4=11-2x\)
\(x+2x=11+4\)
\(3x=15\)
\(x=5\)
\(b.7x-10=x-28\)
\(7x-x=-28+10\)
\(6x=-18\)
\(x=-3\)
\(c.x-3.x-2=0\)
\(\left(1-3\right).x-2=0\)
\(-2.x-2=0\)
\(-2x=2\)
\(x=-1\)
\(d.|x-5|=10\)
\(\Rightarrow\orbr{\begin{cases}x-5=10\\x-5=-10\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=15\\x=-5\end{cases}}\)
\(e.9-25=\left[7-x\right]-\left[25+7\right]\)
\(-16=\left[7-x\right]-32\)
\(-16+32=7-x\)
\(16=7-x\)
\(x=7-16\)
\(x=-9\)
a,x-4=11-2x
x+2x=11+4
3x=15
x=15:3
x=5
Vậy x=5
b,7x-10=x-28
7x-x=-28+10
6x=-18
x=-18:6
x=-3
Vậy x=-3
c,x-3.x-2=0
x.(1-3)-2=0
-2x-2=0
-2x=2
x=2:(-2)
x=-1
Vậy x=-1
d,Ix-5I=10
=> x-5=10 hoặc x-5=-10
=> x=15 hoặc x=-5
Vậy x=15 hoặc x=-5
e, 9-25=[7-x]-[25+7]
-16=[7-x]-32
-16+32=7-x
-16=7-x
7-(-16)=x
23=x
Vậy x=23
