If for some $\alpha$ and $\beta$ in R , the intersection of the following three planes
$\begin{aligned} & x+4 y-2 z=1 \\ & x+7 y-5 z=\beta \\ & x+5 y+\alpha z=5\end{aligned}$
is a line in $\mathrm{R}^3$, then $\alpha+\beta$ is equal to
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