Solve in $\mathbb{R}$: $$\log_3 x^2 - 2\log_{-x} 9 = 2$$
First, I put the condition that $x < 0$. Then, I've rewritten $\log_3 x^2$ as $2\frac{\log_{-x} x}{\log_{-x} 3}$ and got the following equation: $$\log_{-x} \frac{x}{3} = \log_{-x}^2 9$$
Now I need to solve this new equation, but I don't know how.
Thank you in advance!