Réponse :
Explications étape par étape
Bonsoir
Résoudre :
x + 5 = 9
x + 5 - 5 = 9 - 5
x = 4
x - 4 = 13
x - 4 + 4 = 13 + 4
x = 17
-7 = x - 3
-7 + 3 = x - 3 + 3
x = -4
7x = 21
7x/7 = 21/7
x = 3
-3x = 12
-3x/-3 = 12/-3
x = -4
5x = -3
5x/5 = -3/5
x = -3/5
5x - 25 = 0
5x - 25 + 25 = 0 + 25
5x = 25
5x/5 = 25/5
x = 5
3x + 1 = 7
3x + 1 - 1 = 7 - 1
3x = 6
3x/3 = 6/3
x = 2
7x + 13 = -2
7x + 13 - 13 = -2 - 13
7x = -15
7x/7 = -15/7
x = -15/7
