a,

2x - 138 = 3^2 . 2^3

2x - 138 = 9 . 6 = 54

2x = 54 + 138 = 192

x = 96   Vậy x = 96

b, 

x = 2^4+3^2 . 3^2

x = 16 + 81 = 97

Vậy x = 97

c,

6x - 39 = 588 : 28

6x - 39 =  21

6x = 21 + 39 = 60

x = 60 : 6 =10 

 Vậy x = 10 

d,

42x + 37.42 = 39.42

42x + 1554 =  1638

42x = 1638 - 1554 = 84

x = 84 : 42 = 2

Vậy x = 2

e, 71 + 26 - 3x : 5 = 75

97 - 3x : 5 = 75

3x : 5 = 97 - 75 = 22

3x = 22.5 = 110

x= 110/ 3

mà x thuộc z nên x thuộc rỗng

f,

x - 17 = -8-17

x - 17 = -25

x = -25 + 17

x = -8

Vậy x = -8

g, 5x - 2 . 6^3 = 3 . 6^5

5x - 2 . 216 = 3 .  7776

5x - 432 = 233328

5x = 233328 + 432 = 23760

x = 23760 : 5 = 4752

Vậy x = 4752

h,

3x - 2^4 . 7^3 = 2 . 7^4

3x - 16 . 343 = 2. 2401=4802

3x - 5488 = 4802

3x = 4802+5488 = 10290

x = 10290 : 3 

x = 3430

Vậy x = 3430

i,

4 - 27 - 3 = x - 13 - 4

-26 = x - 9

x = -26 + 9 = -17

Vậy x = -17

j , 7 - x = 8 - (-7)

7 -x =  15

x = 7 -15 

x = -8

Vậy x = -8

k,

 2x - 6 = -3 - (-7)

2x - 6 = 4 

2x = 4 + 6 = 10 

x = 5

Vậy x = 5

I,

10 + 2x = 4^5 : 4^3

10 + 2x = 4

2x = 4- 10 = -6

x = -6:2 = -3

Vậy x = -3

`a)2x-138=3^2 . 2^3`

` 2x-138=9 . 8`

`2x-138=72`

`2x=72+138`

`2x=210`

`x=210:2`

`x=105`

Vậy: `x=105`

`b)x=2^4 +3^2.3^2.`

`x=16+9.9`

`x=16+81`

`x=97`

Vậy : `x=97`

`k) 2x-6=-3-(-7)`

`2x-6=-3+7`

`2x-6=4`

`2x=4+6`

`2x=10`

`x=10:2`

`x=5`

Vậy: `x=5`

`l)10+2x=4^5:4^3`

`10+2x=4^{5-3}`

`10+2x=4^2`

`10+2x=16`

`2x=16-10`

`2x=6`

`x=6:2`

`x=3`

Vậy: `x=3`