[tex]x=\frac{y+1}{2}+z\\\\\frac{y+1}{2}+z=x\\\\z=x-\frac{y+1}{2}[/tex]
[tex]x = (y + 1) \div 2 + z \\ \\ x = \frac{y + 1}{2} + z | - \frac{y + 1}{2} \\ \\ z = x - \frac{y + 1}{2} [/tex]
