Plane From Vector Projection

Let $ \mathbf{w} = \begin{pmatrix} 1 \\ 0 \\ -3 \end{pmatrix} $. The set of vectors $ \mathbf{v} $ such that \[\operatorname{proj}_{\mathbf{w}} \mathbf{v} = \mathbf{0}\]lie on a plane. Enter the equation of this plane in the form \[Ax + By + Cz + D = 0,\]where $ A, $ $ B, $ $ C, $ $ D $ are integers such that $ A > 0 $ and $ \gcd(|A|,|B|,|C|,|D|) = 1 $.

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