Réponse :
Explications étape par étape
Bonjour
Résoudre :
x - 7 = 4
x - 7 + 7 = 4 + 7
x = 11
2x = 13
2x/2 = 13/2
x = 13/2
x = 6,5
9 - x = 5
9 - x + x = 5 + x
9 - 5 = 5 + x - 5
4 = x
x = 4
4x = 0
4x/4 = 0/4
x = 0
Exercice 47 :
Résoudre :
3x + 5 = 4x - 7
3x + 5 - 3x = 4x - 7 - 3x
5 + 7 = x - 7 + 7
12 = x
x = 12
2x - 9 = 8x + 3
8x - 2x = -9 - 3
6x = -12
x = -12/6
x = -2
-2x + 3 = 3x - 1
3x + 2x = 3 + 1
5x = 4
x = 4/5
5 - 2x = x
x + 2x = 5
3x = 5
x = 5/3
1 + 3x/10 = 4 - 2x/5
3x/10 + 2x/5 = 4 - 1
3x/10 + 4x/10 = 3
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
-2 - 4 = 4x
4x = -6
x = -6/4
x = -3/2
