X-3+x/6=1 X+9/2-x=4 X-4/5-x/3=5

 х – 3 + x/6 = 1;

х + х/6 = 3 + 1;

(6х + х) / 6 = 4;

7х / 6 = 4;

7х = 6 * 4;

7х = 24;

х = 24 / 7;

х = 3 3/7.

х + 9/2 – x = 4;

 х – х + 9/2 = 4;

9/2 ≠ 4.

Данное уравнение не имеет решения.

х - 4/5 - x/3 = 5;

- х/3 + х – 4/5 = 5;

- 4/5 + 2х/3 = 5;

2х/3 = 29/5;

х = 29/5  /  2/3;

х = 87/10;

х = 8,7.