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\text { 28. Let } f \text { be a function for which } f\left(-\frac{1}{3} x\right)=x^{2}+x+3 \text {. Find the } \text { sum of all values of } z
\text { for which } f(-2 z)=9 A -3/2- B 5/2 C1/2 D-5/6 E -1/6
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