5x - 2x−4x-4x−4 ≤ 9x + 205x - 2x + 8 ≤ 9x + 203x + 8 ≤ 9x + 208 ≤ 6x + 20-12 ≤ 6x-2 ≤ x
Ответ: x ≥ -2.
5x - 2x−4x-4x−4 ≤ 9x + 20
5x - 2x + 8 ≤ 9x + 20
3x + 8 ≤ 9x + 20
8 ≤ 6x + 20
-12 ≤ 6x
-2 ≤ x
Ответ: x ≥ -2.