2. a) x=9
b) c) nu vad clar
3. a) 3(x-3)≤15
3x-9≤15/+9
3x≤24/:3
x≤8 ⇒ x= {0,1,2,3,4,5,6,7,8}
b) (x+2)6-12≤24
6x+12-12≤24
6x≤24/:6
x≤4 ⇒ x={0,1,2,3,4}
c) 18x-14≥2(3x+5)
18x-14≥6x+10
18x-6x≥14+10
12x≥24/:12
x≥2 ⇒x=2,3,4,5...+∞
d)81:(x-9)>9 si x:5≥2 ⇒x≥10
