Bonjour j'ai du mal sur cet exercice merci de m'aider

bonjour
100 x = 1 000
x = 1 000 /100
x = 10
100 x = 1
x = 1/100
4 x = 1
x = 1/4
4 x + 34 = 54
4 x = 54 - 34
4 x = 20
x = 5
- 5 + x = 1
x = 1 + 5
x = 6
- x + 4 = 8
- x = 8 - 4
- x = 4
x = - 4