Решить неравенство X-4 -----=>2 X+5
(x -4) /(x+5) ≥2; 0 ≥ 2 -(x -4) /(x+5)⇔ [ 2 -(x -4) /(x+5) ≤ 0 .] (2(x+5) -(x-4))/(x+5) ≤ 0; (x+14)/(x+5) ≤ 0 ; - + - ---------------- (-14) ------------ (- 5) ------------------ x∈ [ -14 ; 5).