Répondre :
Bonsoir
a)
2x-5 =5x+1
2x - 5x = 1 + 5
- 3x = 6
x = - 6/3
x = - 2
b)
3-7x=3x+2
- 7x - 3x = 2 - 3
- 10x = - 1
x = 1/10
c)
5x-6=-x+3
5x + x = 3 + 6
6x = 9
x = 9/6
x = 3/2
d)
2x- 1/3 =1
2x = 1 + 1/3
2x = 3/3 + 1/3
2x = 4/3
6x = 4
x = 4/6
x = 2/3.
Réponse:
a)
2x-5 +5x = 5x+1 -5x
7x-5 +5 = +1 +5
7x = 6
b)
3-7x -3 = 3x+2 +3
-7x +3x = 3x+5 -3x
-4x = +5
c)
5x-6 +6 = -x+3 +6
5x -x = -x+9 +x
4x = +9 (a vérifier au cas ou)
d)
(j'ai pas fait désolé)