Réponse :
Explications étape par étape
Bonjour,
1) 6x-2=x-3
6x-x = -3 +2
5x = -1
x= -1/5
2) 7x-4=2x+5
7x-2x = 5 +4
5x = 9
x= 9/5
3)3x+7=-3x
3x+3x = -7
6x = -7
x= -7/6
4)5x-3=-13x +6
5x+ 13x = 6 +3
18x = 9
x= 9/18 = 1/2
5) 3-2x=x+15
3-15 = x+2x
-12 = 3x
-12/3 = -4
6)4x+7=15x-3
7+3 = 15x -4x
10 = 11x
x= 10/11
Bonjour !
1)
6x - 2 = x - 3
6x - 2 + 2 = x - 3 + 2
6x = x - 1
6x - x = x - x - 1
5x = -1
x = -1/5
2)
7x - 4 = 2x + 5
7x - 4 + 4 = 2x + 5 + 4
7x = 2x + 9
7x - 2x = 2x - 2x + 9
5x = 9
x = 9/5
3)
3x + 7 = -3x
3x + 7 - 7 = -3x - 7
3x = -3x - 7
3x + 3x = -3x + 3x - 7
6x = -7
x = -7/6
4)
5x - 3 = -13x + 6
5x - 3 + 3 = -13x + 6 + 3
5x = -13x + 9
5x + 13x = -13x + 13x + 9
18x = 9
x = 1/2
5)
3 - 2x = x + 15
3 - 3 - 2x = x + 15 - 3
-2x = x + 12
-2x - x = x - x + 12
-3x = 12
x = -4
6)
4x + 7 = 15x - 3
4x + 7 - 7 = 15x - 3 - 7
4x = 15x - 10
4x - 15x = 15x - 15x - 10
-11x = -10
x = 10/11
J'espère t'avoir aidé. Bon courage !