[tex] \frac{z + 2}{2z - 1} = \frac{2}{3} [/tex]
3×(z+2)=2×(2z-1)
3z+3×2=2×2z-2×1
3z+6=4z-2 /-3z
6=4z-2-3z /+2
6+2=z
z=8
