Answer
$\displaystyle y=\frac{V-xz}{x+z}$
Work Step by Step
We solve for $y$:
$\displaystyle V=xy+yz+xz$
$\displaystyle V=y(x+z)+xz$
$\displaystyle V-xz=y(x+z)$
$\displaystyle y=\frac{V-xz}{x+z}$
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