avisshnya

1) |1+2х|<9

1+2х<9

2х<9-1 |÷2

х<4

2) |3+2х|⩽5

3+2х⩽5

2х⩽5-3 |÷2

х⩽1

3) |1-2х|⩾7

1-2х⩾7

-2х⩾7-1|÷(-2)

х⩽-3