ajutor am nevoie de aceasta problema

PCl5⇄ PCl3 + Cl2
k=[PCl3][Cl2]/ [PCl5]= 0,3x0,8/1,4=0,17
mol initial 2 0 0
mol,echilibru 2-x x x
K= x²/(2-x) =0,17------------------------------> rezolva ecuatia . afla x , apoi 2-x.