\text { 8. Let } f \text { be a function for which } f\left(-\frac{1}{3} x\right)=x^{2}+x+3 \text {. Find the } \text { the sum of all values of } z \text { for which } f(-z)=-6 А -5//В 5/4-C3/4 D -3 E none of

Fig: 1

Fig: 2

Fig: 3