720:[41-(2x-5)=120
41-(2x-5)=720:120
41-(2x-5)=6
2x-5=41-6
2x-5=35
2x=35+5
2x=40
x=40:2
x=20
li-ke cho mình nha
720 : [41 - (2x - 5) ] = 120
[41 - (2x - 5)] = 720 : 120
[41 - (2x - 5)] =6
(2x - 5) = 41 -6
(2x - 5) = 35
2x = 35 + 5
2x = 40
x = 40 : 2
x = 20