Răspuns:
Ex13 : abs(x-2)=9 =>. - x+2<9, x-2<0 => x>-7, x<2
x-2<9, x-2>=0 => x<11, x>=2
x€(-7;11)
Ex 12
a)x>-80/3. b) x<1/5. c) x<=-3/2. d) x>-10/7. e) x> - 13/3.. F) x<=-2/5.g) x>=14/5 h) x<=-11/5
