In the $xy$-plane line $l$ has a slope of $m$ and a $y$-intercept of $b$, what is the $x$-intercept of the line $l$ in terms of $m$ and $b$?

- $\quad -\dfrac{b}{m}$
- $\quad -\dfrac{m}{b}$
- $\quad \dfrac{1}{bm}$
- $\quad \dfrac{b}{m}$
- $\quad \dfrac{m}{b}$

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