Mashaal Masha
$$y=-\frac{1}{9}\,x \\ y=\frac{1}{2}\,x$$

The solution to the given system of equations is $(x,y)$. What is the value of $x$?
Difficulty: Medium
A: 

$-9$

B: 

$-7$

C: 

$0$

D: 

$2$

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