If the system of linear equations
$$
\begin{aligned}
& x-2 y+k z=1 \\
& 2 x+y+z=2 \\
& 3 x-y-k z=3
\end{aligned}
$$
has a solution $(x, y, z), z \neq 0$, then $(x, y)$ lies on the straight line whose equation is
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