If the system of linear equations
$$
\begin{aligned}
& x+y+z=5 \\
& x+2 y+2 z=6 \\
& x+3 y+\lambda z=\mu,(\lambda, \mu \in R), \text { has infinitely many }
\end{aligned}
$$
solutions, then the value of $\lambda+\mu$ is ${ }_{\text {s }}$
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