Răspuns :
2*[6-(x:2)]=6
6-(x:2)=6:2
6-(x:2)=3
x:2=6-3
x:2=3
x=3*2
x=6
6-(x:2)=6:2
6-(x:2)=3
x:2=6-3
x:2=3
x=3*2
x=6
2*[6-(x:2)]=6 => 6-(x:2)=6:2 => 6-(x:2)=3 => 6-x/2=3 (amplificat totul cu 2) => 12-x=6 => - x=6-12 => - x=-6 => x=6