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`123-5(x+4)=38`
`5x-20=123-38`
`5x-20=85`
`5x=85+20`
`5x=105`
`x=105:5`
`x=21`
123-5.(x+4)=38
5x-20=123-38
5x-20=85
5x=85+20
5x=105
x=105:5
x=21
![](https://rs.olm.vn/images/avt/0.png?1311)
\(123-5\left(x:2+4\right)=38\\ \Rightarrow5\left(x:2+4\right)=85\\ \Rightarrow x:2+4=17\\ \Rightarrow x:2=13\\ \Rightarrow x=26.\)
\(123-5\left(x:2+4\right)=38\)
\(5\left(x:2+4\right)=123-38\)
\(5\left(x:2+4\right)=85\)
\(x:2+4=85:5\)
\(x:2+4=17\)
\(x:2=17-4\)
\(x:2=13\)
\(x=13.2\)
\(x=26\)
![](https://rs.olm.vn/images/avt/0.png?1311)
123 - 5 . ( x + 4 ) = 38
5 . ( x + 4 ) = 123 - 38
5 . ( x + 4 ) = 85
x + 4 = 85 : 5
x + 4 = 17
x = 17 - 4
=> x = 13
123-5.(x+4)=38
=>5.(x-4)=123-38
=>5.(x-4)=85
=>x-4=85:5
=>x-4=17
=>x=17+4
=>x=21
![](https://rs.olm.vn/images/avt/0.png?1311)
Giải:
\(123-5\left(x-4\right)=38\)
\(\Leftrightarrow5\left(x-4\right)=123-38\)
\(\Leftrightarrow5\left(x-4\right)=85\)
\(\Leftrightarrow x-4=\dfrac{85}{5}\)
\(\Leftrightarrow x-4=17\)
\(\Leftrightarrow x=17+4\)
\(\Leftrightarrow x=21\)
Vậy \(x=21\).
Chúc bạn học tốt!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
\(123-5.\left(x+4\right)=38\)
\(5.\left(x+4\right)=123-38\)
\(5.\left(x+4\right)=85\)
\(x+4=85\div5\)
\(x+4=17\)
\(x=17-4\)
\(x=13\)
Chúc bn hk tốt nhoa :)
123-5.(x+4)=38
5.(x+4)=123-38
5.(x+4)=85
x+4 =85:5
x+4=17
x =17-4
x = 13
![](https://rs.olm.vn/images/avt/0.png?1311)
123 - 5.( x + 4 ) = 38
5.(x + 4 ) = 123 - 38
5.( x + 4 ) = 85
x + 4 = 85 : 5
x + 4 = 17
x = 17 - 4
x = 13
k mk nha mấy bạn
123-5.(x+4)=38
5.(x+4)=123-38
5.(x+4)=85
x+4 =85:5
x+5 =17
x=17-5
x=12
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài làm
5.( x + 4 ) = 123 - 38
5 . ( x + 4 ) = 85
x + 4 = 85 : 5
x + 4 = 17
x = 17 - 4
x = 13
Vậy x = 13
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x-12=-15
x=-15+12
x=-3
b) 123-5(x+4)=38
5(x+4)=123-38
5(x+4)=85
x+4=85:5=17
x=17-4
x=13
\(a.x-12=-15\) \(b.123-5.\left(x+4\right)=38\)
\(x=\left(-15\right)+12\) \(5.\left(x+4\right)=123-38\)
\(x=-3\) \(5.\left(x+4\right)=85\)
\(x+4=85:5=17\)
\(x=17-4=13\)
\(123-5\left(x+4\right)=38\\ 5\left(x+4\right)=85\\ x+4=17\\ x=13\)
\(123-5\left(x+4\right)=38\)
\(\Rightarrow123-5x-20=38\)
\(\Rightarrow-5x=-65\)
\(\Rightarrow x=13\)
Vậy: ...