tolong jawab dengan cara positif dan negatif pd setiap soal thank you

1.
3 | x - 4 | + 5 = 14
3 | x - 4 | = 9
| x - 4 | = 3

x - 4 = 3
x = 7

-(x - 4) = 3
-x + 4 = 3
x = 1

Hp = {7 , 1}

2.
| 3x - 7 | = 15

3x - 7 = 15
3x = 22
x = 22/3

3x - 7 = -15
3x = -8
x = -8/3

Hp = {-8/3 , 22/3 }

3.
| 2x + 3 | = 4x - 7

2x + 3 = 4x - 7
2x = 10
x = 5

-(2x + 3) = 4x - 7
-2x - 3 = 4x - 7
6x = 4
x = 2/3

Hp = {5, 2/3}