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;+∞]