hp 2.) 3x - 9 < 0 3.)4x <= -12 6x + 18 <= 0

2.
3x - 9 < 0
3x < 9
x < 9 : 3
x < 3
Himpunan Penyelesaian = {x < 3}

3.
4x <= -12
x <= -12 : 4
x <= -3
Himpunan Penyelesaian = {x <= -3}

4.
6x + 18 <= 0
6x <= -18
x <= -18 : 6
x <= -3
Himpunan Penyelesaian = {x <= -3}