Răspuns :
Explicație pas cu pas:
2x + 4 < 12
2x < 12 - 4
2x < 8
x < 8 : 2
x < 4
2) 3x – 5 > 7
3x > 7 +5
3x > 12
x > 12 :3
x > 4
3) 2x – 1 ≤ – 15
2x ≤ – 15 +1
2x ≤ – 14
x ≤ – 14 : 2
x ≤ – 7
4) 5x + 9 > – 6
5x > – 6 -9
5x > – 15
x > – 15 :5
x > – 3
5) −4x + 3 ≥ −5
−4x ≥ −5 -3
−4x ≥ − 8
x ≥ − 8 : -4
x ≥ 2