How to take the partial derivative $\frac{\partial x}{\partial y}_z$ if $x$ occurs in our definition of $x$ itself?

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$\frac{\partial x}{\partial y}_z$ holds $z$ constant. If our definition of $x$ has $x$ occuring on the right hand side, do we assume $x$ is "constant" for the purposes of our partial differentiation? i.e. is $\frac{\partial x}{\partial y}_z = \frac{\partial x}{\partial y}_{x,z}$?