Bonjour,
a)
6x-4x ≥ -1-5
2x ≥ -6
x ≥ -6/2
x ≥ -3
b)
-6-4 < -x +5x
-10 < 4x
x > -10/4
x > -5/2
x > -2,5
c)
1+9 ≤ 7x-5x
10 ≤ 2x
x ≥ 10/2
x ≥ 5
d)
1+3 > 5x +8x
4 > 13x
x < 4/13