Пошаговое объяснение:

1. 1/2х + 1/2х = 1. 2/3

1. 2/2х = 1. 2/3

2х = 5/3

х = 5/3 : 2

х = 5/3 * 1/2

х = 5/6

3. 4/5х - 1. 7/10х = 3. 1/2

3. 8/10х - 1. 7/10х = 3. 1/2

2. 1/10х = 3. 1/2

21/10х = 7/2

х = 7/2 : 21/10

х = 7/2 * 10/21

х = 1/1 * 5/3

х = 5/3

х = 1. 2/3

3/5 + 4/5х + 7/10х + 1. 1/2 = 5. 3/5

4/5х + 7/10х = 5. 3/5 - 3/5 - 1. 1/2

8/10х + 7/10х = 5 - 1. 1/2

15/10х = 4. 2/2 - 1. 1/2

3/2х = 3. 1/2

3/2х = 7/2

х = 7/2 : 3/2

х = 7/2 * 2/3

х = 7/3

х = 2. 1/3