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