Réponse :
Explications étape par étape
Bonjour
Résoudre :
3x + 5 = 4x - 7
5 + 7 = 4x - 3x
12 = x
x = 12
5x/4 = 25/16
x = 25/16 * 4/5
x = 25/5 * 4/16
x = 5 * 1/4
x = 5/4
x^2 + 3 - x = 3x - 1
x^2 - x - 3x + 3 + 1 = 0
x^2 - 4x + 4 = 0
(x - 2)^2 = 0
x - 2 = 0
x = 2
5 - 2x = x
5 = x + 2x
5 = 3x
x = 5/3
1 + 3x/10 = 4 - 2x/5
3x/10 + 4x/10 = 4 - 1
7x/10 = 3
x = 3 * 10/7
x = 30/7
x^7 + 3x - 2 = 7x + 4 + x^7
x^7 - x^7 - 2 - 4 = 7x - 3x
-6 = 4x
x = -6/4
x = -3/2
