bonjour
2(3x+1)-1<0
6x+2-1<0
6x+1<0
6x<-1
x<-1/6
S = [-∞;-1/6[
b.
7-(x-2)≤2x+3
7-x+2≤2x+3
-x-2x+9≤3
-3x≤-6
x≥2
S [2;+∞[
Bonjour,
. 2(3x + 1) -1<0
6x +2 -1 < 0
6x< 1-2
6x < -1
x < -1/6
7- (x - 2)≤ 2x + 3
7-x+2 ≤ 2x+3
7+2-3 ≤ 2x +x
6 ≤ 3x
x ≥ 6/3
x ≥ 2