Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$(\frac{-1+\sqrt{-3}}{2})^{9}+(\frac{-1-\sqrt{-3}}{2})^{9}$$

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