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Voi \(x\ge-3\Rightarrow|x+3|=x+3\)
\(\Rightarrow PT\Leftrightarrow5x+6-\left(x+3\right)=13\)
\(\Leftrightarrow4x+3=13\)
\(\Leftrightarrow x=\frac{5}{2}\)(THOA MAN DK )
VAY X=5/2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-5x-\left(-3\right)=13\)
\(\Leftrightarrow-5x+3=13\)
\(\Leftrightarrow-5x=10\)
\(\Leftrightarrow x=-2\)
Vậy....
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a, x - 3 : 2 = 5 14 : 5 12
=> x - 3 : 2 = 5 2
=> x - 3 : 2 = 25
=> x – 3 = 25
=> x = 53
b, 30 : x - 7 = 15 19 : 15 18
=> 30 : x - 7 = 15
=> x – 7 = 2
=> x = 9
c, x 70 = x
=> x 70 - x = 0
=> x ( x 69 - 1 ) = 0
=>
d, 2 x + 1 3 = 9 . 81
=> 2 x + 1 3 = 9 3
=> 2x + 1 = 9
=> x = 4
e, 5 x + 5 x + 2 = 650
=> 5 x 1 + 5 2 = 650
=> 5 x . 26 = 650
=> 5 x = 25
=> x = 2
f, 4 x - 1 2 = 25 . 9
=> 4 x - 1 2 = 5 2 . 3 2
=> 4 x - 1 2 = 15 2
=> 4x – 1 = 15
=> x = 4
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![](https://rs.olm.vn/images/avt/0.png?1311)
Tìm x sao cho:
3 + (5x + 4) - (4x -9) = 17 - (13 - 27)
3 +(5x + 4) - ( 4x-9) = 17- (-14)
3 +(5x + 4) - ( 4x-9) = 31
(5x + 4) - ( 4x-9)= 31-3
(5x + 4) - ( 4x-9)= 28
5x + 4 - 4x + 9=28
(5x-4x) + ( 4+ 9 )=28
x + 13 =28
x= 28-13
x= 15. Vậy x=15. T nha
=> 3+5x+4-4x+9=17-13+27
=> x + 16 = 31
=> x = 31 - 16 = 15
Vậy x = 15
k mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a, x : 46 / 15 = 13 / 12
x = 13/12 . 46/15
x = 299/90
b, - 2/3x + 1 / 5 = 3 / 10
- 2 / 3 x = 3 / 10 - 1 / 5
- 2 / 3 x = 1 / 10
x = -3 / 20
c, x : 13 / 3 = - 2 / 5
x = - 2 / 5 . 13 / 3
x = -26 /15
d, 2 / 4 x + 2 / 5 x = 1
x ( 2 / 4 + 2 / 5 ) = 1
x . 9 / 10 = 1
x = 10 / 9
-5x - ( -3) = 13
-5x = 13 + ( -3)
-5x = 10
x = 10 :(-5)
x = -2
13+(-3)=-5x
10=-5x
x=10:-5=-2