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\(a,12\left(x-1\right)=0\\ x-1=0\\ x=1\\ b,45+5\left(x-3\right)=70\\ 5\left(x-3\right)=25\\ x-3=5\\ x=8\\ c,3.x-18:2=12\\ 3.x-9=12\\ 3.x=21\\ x=7\)
![](https://rs.olm.vn/images/avt/0.png?1311)
5x+x=150:2+3
5x+x=75+3
5x+x=78
5x+1x=78
(5+1)x=78
6x=78
x=78:6
x=13.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,4\left(x-3\right)=7^2-1^3\)
\(4\left(x-3\right)=49-1\)
\(4\left(x-3\right)=48\)
\(\Rightarrow x-3=48:4\)
\(x-3=24\)
\(\Rightarrow x=27\)
\(5x+x=\frac{150}{2}-3\)
\(6x=75-3\)
\(6x=72\)
\(\Rightarrow x=12\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(5x+x=\frac{150}{2}+3\)
\(\Leftrightarrow6x=78\)
\(\Leftrightarrow x=13\)
5x + x = 150 : 2 + 3
6x = 75 + 3
6x = 78
x = 78 : 6
x = 13
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 4.(x-3)=72-13
=> 4(x - 3) = 49 - 1
=> 4(x - 3) = 48
=> x - 3 = 12
=> x = 15
b, 5x+x=150:2+3
=> 6x + = 75 + 3
=> 6x = 78
=> x = 13
a) 4(x-3)=72-13
<=> 4(x-3)=49-1
<=> 4(x-3)=48
<=> x-3=12
<=> x=15
Vậy x=15
b) 5x+x=150:2+3
<=> 6x=75+3
<=> 6x=78
<=> x=13
Vậy x=13
![](https://rs.olm.vn/images/avt/0.png?1311)
\(5x+x=150:2+3\)
\(\Leftrightarrow6x=75+3\)
\(\Leftrightarrow6x=78\)
\(\Leftrightarrow x=13\)
![](https://rs.olm.vn/images/avt/0.png?1311)
5x+x=150:2+3
6x=75+3
6x=78
x=78:6
x=13
6x=75+3
6x=78
x=78:6
x=13