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$$l=\frac{125}{m}+50 n$$$\newline$The equation gives the quantity $l$ in terms of the quantities $m$ and $n$. Which of the following equations correctly expresses $n$ in terms of $l$ and $m$ ?$\newline$Choose $1$ answer:$\newline$(A) $n=\frac{l-125}{50 m}$$\newline$(B) $n=\frac{l}{50}-\frac{125}{m}$$\newline$(C) $n=\frac{l}{50}-\frac{5}{2 m}$$\newline$(D) $n=\frac{5}{2 m}-\frac{l}{50}$