Bonjour
7x + 9 = 11
<=> 7x = 11-9
<=> 7x = 2
<=> x = 2/7
5-3x = 12
<=> -3x = 12-5
<=> -3x = 7
<=> x = 7/-3
<=> x = -7/3
4x-8 = 14
<=> 4x = 14+8
<=> 4x = 22
<=> x = 22/4
<=> x = 11/2
-x-11 = -5
<=> -x = -5+11
<=> -x = 6
<=> x = -6
2x-2 = 8x-8
<=> 2x-8x = -8+2
<=> -6x = -6
<=> x = -6/-6
<=> x = 6/6
<=> x = 1
3x-8 = 7x+2
<=> 3x-7x = 2+8
<=> -4x = 10
<=> x = 10/-4
<=> x = 5/-2
<=> x = -5/2
11+x = 7-13x
<=> x+13x = 7-11
<=> 14x = -4
<=> x = -4/14
<=> x = -2/7
Voilà j'espère avoir pu t'aider
PS : La prochaine fois stp, n'oublie pas de mettre un petit bonjour, cela nous fait toujours plaisir ^^
