Răspuns :
(3*x-5*4)*6-2*11=20
(3*x-20)*6-22=20
(3*x-20)*6=42
3*x-20=42:6
3*x-20=7
3*x=27
x=27:3
x=9
(3*x-20)*6-22=20
(3*x-20)*6=42
3*x-20=42:6
3*x-20=7
3*x=27
x=27:3
x=9