Mashaal Masha
$$f(x)=(x-14)(x+19)$$

The function $f$ is defined by the given equation. For what value of $x$ does $f(x)$ reach its minimum?
Difficulty: Hard
A: 

$-266$

B: 

$-19$

C: 

$-\frac{33}{2}$

D: 

$-\frac{5}{2}$

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