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I have no idea how to do number 9 please help

I have no idea how to do number 9 please help-example-1
User Dabuki
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\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{ }*\text{ 2 = 9z +9 -96} \\ 66\text{ = 9z - 90} \\ 66+90\text{ = 9z} \\ 156\text{ = 9z} \\ z\text{ =}(156)/(9)\text{ = 17.33 }\approx\text{ 17} \end{gathered}

User Multitut
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