If the system of equations
$$
\begin{aligned}
& 2 x+\lambda y+3 z=5 \\
& 3 x+2 y-z=7 \\
& 4 x+5 y+\mu z=9
\end{aligned}
$$
has infinitely many solutions, then $\left(\lambda^2+\mu^2\right)$ is equal to
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