(2x-11):3+11=4
(2x-11):3=15
2x-11=5
2x=16
x=8
[(2x - 11) : 3 + 1] × 5 = 20
(2x - 11) : 3 + 1 = 20 : 5
(2x - 11) : 3 + 1 = 4
(2x - 11) : 3 = 4 - 1
(2x - 11) : 3 = 3
2x - 11 = 3 × 3
2x - 11 = 9
2x = 9 + 11
2x = 20
x = 20 : 2
x = 10
Vậy x = 10
~ Học tốt ~ .❤