Evaluate this alpha substitution in $[(zx)/x]λz.xyz$

I am having difficulty with the following problem :
Evaluate the following where the notation $[y/x]$ means replace $x$ with $y$:


If I were to simply replace $x$ with $zx$ in this expression it would yield :
$lambda z.zxyz$ but I am not sure if this is correct. Any tips appreciated.

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