Question

2x-4=8
e
10x-20=50 
e
3x+7=22
e
7x+9=-40

Answer 1

a) 2x - 4 = 8
2x = 8 + 4
2x = 12
x = 12/2
x = 6

b) 10x - 20 = 50
10x = 50 + 20
10x = 70
x = 70/10
x = 7

c) 3x + 7 = 22
3x = 22 - 7
3x = 15
x = 15/3
x = 5

d) 7x + 9 = - 40
7x = - 40 - 9
x = - 49/7
x =  - 7

Answer 2

2x-4=8
2x=8+4
2x=12
x=12/2
x=6

10x+20=50
10x=50+20
10x=70
x=70/10
x=7

3x+7=22
3x=22-7
3x=15
x=15/3
x=5

7x+9=-40
7x=-40-9
7x=-49
x=-49/7
x=-7