1) (3x-1)(x+1)(2x+3) = 0

Решим уравнение по отдельности:

3x - 1 = 0
3x = 1
x = 1/3

x + 1 = 0
x = -1

2x + 3 = 0
2x = -3
x = -3/2

Ответ: x = 1/3, x = -1, x = -3/2

2) |3x + 1| = 2

3x + 1 = 2
3x = 1
x = 1/3

3x + 1 = -2
3x = -3
x = -1

Ответ: x = 1/3, x = -1

3) |3 - 4x| = 3x - 2

3 - 4x = 3x - 2
7x = 5
x = 5/7

3 - 4x = - (3x - 2)
3 - 4x = -3x + 2
7x = -1
x = -1/7

Ответ: x = 5/7, x = -1/7