dau coroana
clasa a 8 a

[2(x+3)-12]/(x+3) · (x-3)(x+3)/(x-3)²=
simplificam
(2x-6)/(x+3) ·(x+3)/(x-3)=
2(x-3)/(x+3)·(x+3)/(x-3)=2