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a) X x 4 = 80
X = 80 : 4
X = 20
b) 3 x X = 90
X = 90 : 3
X = 30
![](https://rs.olm.vn/images/avt/0.png?1311)
Tìm x :
x + 80 = 40 x 3
x + 80 = 120
x = 120 - 80
x = 40
Vậy x = 40
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Tìm x :
x + 80 = 40 x 3
x + 80 = 120
x = 120 - 80
x = 40
Vậy x = 40
![](https://rs.olm.vn/images/avt/0.png?1311)
a)\(\left(42.x\right):x-3=3\)
\(\Leftrightarrow\left(42.x\right):x=6\)
\(\Leftrightarrow42x=6x\)
\(\Leftrightarrow42x-6x=0\)
\(\Leftrightarrow36x=0\)
\(\Leftrightarrow x=0\)
b)\(120+\left(x+5\right).6+x=220\)
\(\Leftrightarrow6x+30+x=100\)
\(\Leftrightarrow7x=70\Leftrightarrow x=10\)
a) 42.x :x − 3 = 3
⇔ 42.x :x = 6
⇔42x = 6x
⇔42x − 6x = 0
⇔36x = 0
⇔x = 0
b)120 + x + 5 .6 + x = 220
⇔6x + 30 + x = 100
⇔7x = 70⇔x = 10
k cho mk nha mk ko chép mạng đâu @@@
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![](https://rs.olm.vn/images/avt/0.png?1311)
[ 3 . ( x + 2 ) : 7 ] . 4 = 120
[ 3 . ( x + 2 ) : 7 ] = 120 : 4
[ 3 . ( x + 2 ) : 7 ] = 30
3 . ( x + 2 ) = 30 . 7
3 . ( x + 2 ) = 210
( x + 2 ) = 210 : 3
( x + 2 ) = 70
x = 70 - 2
x = 68
\(\left[3.\left(x+2\right):7\right].4=120\)
\(3.\left(x+2\right):7=480\)
\(3.\left(x+2\right)=480.7\)
\(3.\left(x+2\right)=3360\)
\(x+2=3360:3\)
\(x+2=1120\)
\(x=1120-2\)
\(x=1118\)
![](https://rs.olm.vn/images/avt/0.png?1311)
`x xx5+x=120`
`=>x xx (5+1)=120`
`=> x xx 6=120`
`=>x=120:6`
`=>x=20`
x + 120 = 80 x 3
x + 120 = 240
x = 240 - 120
x = 120
Tìm x :
x + 120 = 80 x 3
x + 120 = 240
x = 240 - 120
x = 120
Vậy x = 120