If P is a $$3 \times 3$$ matrix such that $$P^T = 2P + I$$, where $$P^T$$ is the transpose of P and I is the $$3 \times 3$$ identity matrix, then there exists a column matrix $$X = \begin{bmatrix}x \\y \\z\end{bmatrix} \neq \begin{bmatrix}0 \\0 \\0\end{bmatrix}$$ such that
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