[tex]\begin{gathered} \text{The cirle rule is this.} \\ 33\text{ = }\frac{(9z+9)\text{ - 96}}{2} \\ By\text{ cross multip;yin, we will have} \\ 33\text{ }\times\text{ 2 = 9z +9 -96} \\ 66\text{ = 9z - 90} \\ 66+90\text{ = 9z} \\ 156\text{ = 9z} \\ z\text{ =}\frac{156}{9}\text{ = 17.33 }\approx\text{ 17} \end{gathered}[/tex]
