bonjour
a) 2x +9 =5
2x = 5-9
x = -4/2
x = -2
b) 5-4x=1
-4x = 1-5
x = -4/-4
x = 1
c) 6x-7=4
6x = 4+7
x= 11/6
d) -8-3x=2
-3x = 2+8
x = 10/-3 (toute la fraction en négatif)
e) 6x+8=1
6x = 1 -8
x = 7/-6 (toute la fraction en négatif)
f) -5+7x = -5
7x = -5 + 5
x = 0
g) 4-0,1x=-6
0.1x = -6-4
x = -10/-0,1
x = 100
h) -5,5-3x = -7,5
-3x= -7,5+5,5
x = -2/-3
x = 2/3
