1-х 2х-7 7х-2
3 - ----- ≥ ----- + ------
2 6 3
2-1-х 2х-7 + 2(7х-2)
3- -------- ≥ -------------------
2 6
1-х 2х-7 +14х-4
3- -------- ≥ -------------------
2 6
1-х 16х-11
3- -------- - ---------- ≥0
2 6
3(1-х)-16х-11
3- ------------------ ≥0
6
-19х-8
3- ---------- ≥0
6
-19х-8
---------- ≤ -3
6
-19х-8≤-18
19x≥10
x≥19/10
x∈[1.9;+∞]