Sagot :
Réponse :
bonjour
-2x+3=-7
-2x=-7-3
-2x=-10
x=-10/-2=5
x/9=-3
x=-27
x-11=-7
x=-7+11
x=4
2x+11=-3x+26
2x+3x=26-11
5x=15
x=15/5=3
5x+4=-1+4x
5x-4x=-1-4
x=-5
7x+17=9x+29
7x-9x=29-17
-2x=12
x=12/-2=-6
Explications étape par étape
Bonjour,
a) - 2x + 3 = - 7
- 2x = - 7 - 3
x = 10/2
x = 5
b) x/9 = - 3
x = - 3 * 9
x = - 27
c) x - 11 = - 7
x = - 7 + 11
x = 4
d) 2x + 11 = - 3x + 26
2x + 3x = 26 - 11
5x = 15
x = 15/5
x = 3
e) 5x + 4 = 4 (2 + x) - 9
5x + 4 = 8 + 4x - 9
5x - 4x = 8 - 9 - 4
x = - 5
f) 7x + 17 = 9x + 29
7x - 9x = 29 - 17
- 2x = 12
x = - 12/2
x = - 6.