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The quantity $z$ varies directly with $y$ and inversely with $x$. When $y = -12$ and $x = -4$, $z = -36$. What is the equation of variation? Write your answer in the form $A$ or $\frac{A}{B}$, where $A$ and $B$ are constants or variable expressions. Remember to include the value of $k$, the constant of variation, in exact form.$\newline$ $\ z$=______