4x+(2/3)=2(x-(2/3))

4x+(2/3)= 2x-(4/3)

2x=(-4/3)-(2/3)

2x=(-6/3)

2x=-2

x=-1

проверка : 4*(-1)+ (2/3)=2*((-1)-(2/3))

                  -4+2/3=-2-(4/3)

                      (-12/3)+(2/3)=(-6/3)-(4/3)

                      -10/3=-10/3

                            ч.т.д.