1/6x - 0,2 = 1/2x + 0,85 и - 6 * (8-3x) - 2 * (5-x)

Найдем корни:

1) 1 / (6 * x - 0,2) = 1 / (2 * x + 0,85);

6 * x - 0.2 = 2 * x + 0.85;

6 * x - 2 * x = 0.85 + 0.2;

x * (6 - 2) = 1.05;

x * 4 = 1.05;

4 * x = 1.05;

x = 1.05/4;

x = 105/400;

x = 21/80.

2) - 6 * (8 - 3 * x) - 2 * (5 - x) = 0;

-6 * 8 + 6 * 3 * x - 2 * 5 + 2 * x = 0;

-48 + 18 * x - 10 + 2 * x = 0;

18 * x + 2 * x = 48 + 10;

x * (18 + 2) = 58;

20 * x = 58;

x = 58/20;

x = 29/10;

x = 2.9.