Пошаговое объяснение:

7(х + 2/3) + 1/3 = 4(х + 1/3)

7х + 14/3 + 1/3 = 4х + 4/3

7х + 15/3 = 4х + 1. 1/3

7х + 5 = 4х + 1. 1/3

7х - 4х = 1. 1/3 - 5

3х = 1. 1/3 - 4. 3/3

3х= -3. 2/3

3х = -11/3

х = -11/3 : 3

х = -11/3 * 1/3

х = -11/9

х = -1. 2/9