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Math·Advanced Math·Equivalent expressions

hard

In the given equation, $x,y,$ and $z$ are positive numbers. Which expression is equivalent to $y$?
$\frac{1}{7xy}+xyz=\frac{1}{9yz}$

A

$\frac{7x-9z}{63x^2{z}^2}$

B

$\sqrt{\frac{7x-9z}{63x^2{z}^2}}$

C

$\frac{1}{9x{z}^2-7x^{2}z}$

D

$\sqrt{\frac{1}{9x{z}^2-7x^{2}z}}$