5.(2x+1)=20
2x+1=20/5
2x+1=4
2x=4-1
2x=3
x=3/2
219-7.(x+1)=100
7.(x+1)=219-100
7.(x+1)=119
(x+1)=119:7
x+1=17
x=17-1
x=16
k cho mk nhé chúc bn học tốt
219-7.(x+1)=100
7.(x+1)=219-100
7.(x+1)=119
x+1=119:7
x+1= 17
x=17-1
x=16
5.(2x+1)=20
2x+1=20:5
2x+1=4
2x=4-1
2x=3
x=3:2
x=3/2
vậy x=3/2
219-7.(x+1)=100
7.(x+1)=219-100
7.(x+1)=119
x+1=119:7
x+1=17
x=17-1
x=16
vậy x=16
(3x-6).3=81
3x-6=81:3
3x-6=27
3x=27+6
3x=33
x=33:3
x=1
vậy x=1
(32-x):3 và1/2=2,8
(32-x):7/2=14/5
32-x=14/5.7/2
32-x=49/5
x=32-49/5
x=111/5
vậy x= 111/5
96-3.(x+1)=42
3.(x+1)=96-42
3.(x+1)=54
x+1=54:3
x+1=18
x=18-1
x=17
vậy x = 17
1/2:x=2/3+1/2
1/2:x=7/6
x=1/2:7/6
x=3/7
vậy x= 3/7
41+(68-x)=85
68-x=85-41
68-x=44
x=68-44
x=24
vậy x=24
3.(x+35)=513
x+35=513:3
x+35=171
x=171-35
x=136
vậy x=136
84-3.(x+1)=2
b ơi hình như câu này chép sai đầu bài thì phải
5/6-3/2:x=2/3
3/2:x=5/6-2/3
3/2:x=1/6
x=3/2:1/6
x=9
vậy x=9
84-3.(x+1)=2
3.(x+1)=84-2
3.(x+1)=82
X+1=82÷3
X+1=27,3
X=27,3+1
X=28,3
Vay x=28,3
Mk nghi la mk lam sai
dẹo quá bạn ơiiiii