1. |2x+5|=9 2. |3a+1|=2a+9 3. |2x-9| < 3

1. 2x + 5= 9
2x. = 9 - 5
2x. = 4
x. = 4/2
x. = 2

2. 3a + 1 =2a + 9
3a - 2a = -1 + 9
a = 8

3. |2x-9| < 3
-3 < 2x - 9 < 3
-3+9 < 2x -9 + 9 < 3 + 9
6 < 2x < 12
6/2 < 2x/2 < 12/2
3 < x < 6

Kalau ada yang salah mohon dikoreksi