The sum of all possible values of $\theta \in[0,2 \pi]$, for which the system of equations :
$$
\begin{aligned}
& x \cos 3 \theta-8 y-12 z=0 \\
& x \cos 2 \theta+3 y+3 z=0 \\
& x+y+3 z=0
\end{aligned}
$$
has a non-trivial solution, is equal to:
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