Help... Pas du tout compris les équations ex 42 et 26

26)
a)
2x = 8
x = 8/2
x = 4

b)
- 4x = 28
x = - 28/4
x = - 7

c)
11x = - 55
x = - 55/11
x = - 5

d)
- 5x = - 20
5x = 20
x = 20/5
x = 4

e)
7x = - 2
x = - 2/7

f)
15x = - 5
x = - 5/15
x = - 1/3

42)
a)
11 = - 2 + x
11 + 2 = x
x = 13

b) on voit pas

c)
x - 4/3 = 1
x = 1 + 4/3
x = 3/3 + 4/3
x = 7/3

d) on voit pas

e) 7/2 = x - 1
7/2 + 1 = x
x = 2/2 + 7/2
x = 9/2
x = 4,5

f) on voit pas