1)6-8x 5x+19 2)1-3x2x-9 3)7-5x-11-11х

Вычислим решения неравенств:

1) 6 - 8 * x   5 * x + 19;  

-8 * x - 5 * x gt; = 19 - 6; 

-8 * x - 5 * x gt; = 13; 

x * (-8 - 5) gt; = 13; 

x * (-13) gt; = 13; 

-13 * x gt; = 13; 

x lt; = -13/13; 

x lt; = -1. 

2) 1 - 3 * x 2 * x - 9; 

-3 * x - 2 * x lt; = -9 - 1;

-x * (3 + 2) lt; = -10; 

-5 * x lt; = -10;

x gt; = -10/(-5);

x gt; = 2.

3) 7 - 5 * x -11 - 11 * х; 

-5 * x + 11 * x gt; = -11 - 7; 

11 * x - 5 * x gt; = -18; 

x * (11 - 5) gt; = -18; 

6 * x gt; = -18; 

x gt; = -18/6; 

x gt; = -3.