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Math·Algebra·Linear equations in two variables

hard

$$\frac{3}{c}-\frac{5}{d}=7$$
The given equation relates the variables $c$ and $d$, where $c$ and $d$ are positive constants. Which equation correctly expresses $d$ in terms of $c$?

A

$d=\frac{c}{5(3-7c)}$

B

$d=\frac{5c}{3-7c}$

C

$d=\frac{5(3-7c)}{c}$

D

$d=\frac{3-7c}{5c}$