Question

123-5.(x+4)=38

10+2x=2.(3²-1)

2.x-138=2^3.3²

[102+(28-2x)]:20-5=1​

231-(x-6)=1339:13

Answer 1

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

10+2x=2.(3²-1)

 10+2x=2.(9-1)

 10+2x=2.8

 2x=16-10

2x=6

 x=6:2

 x=3

2.x-138=2³.3²

 2.x-138=72

 2.x=72+138

 2.x=210

 x=210:2

 x=105

[102+(28-2x)]:20-5=1

 (102+28-2x):20=6

 130-2x=120

 2x=130-120

 2x=10

 x=10:2

 x=5

231-(x-6)=1339:13

 231-(x-6)=103

 x-6=231-103

 x-6=128

 x=128+6

 x=134

Answer 2

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

Answer 3

10 + 2x = 2(3² - 1)

=> 10 + 2x = 2(9 - 1)

=> 10 + 2x = 2.8

=> 10 + 2x = 16

=> 2x = 16 - 10

=> 2x = 6

=> x = 6/2

=> x = 3

Answer 4

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

10+2x=2.(3²-1)

=> 10+2x=2.(9-1)

=> 10+2x=2.8

=> 2x=16-10

=> 2x=6

=> x=6:2

=> x=3

2.x-138=2³.3²

=> 2.x-138=72

=> 2.x=72+138

=> 2.x=210

=> x=210:2

=> x=105

[102+(28-2x)]:20-5=1

=> (102+28-2x):20=6

=> 130-2x=120

=> 2x=130-120

=> 2x=10

=> x=10:2

=> x=5

231-(x-6)=1339:13

=> 231-(x-6)=103

=> x-6=231-103

=> x-6=128

=> x=128+6

=> x=134

Answer 5

2x - 138 = 2³.3²

=> 2x - 138 = 8.9

=> 2x - 138 = 72

=> 2x = 138 + 72

=> 2x = 210

=. x = 210/2

=> x = 105