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Math·Advanced Math·Equivalent expressions

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$5a=\frac{4b^2}{a}-20a$
The given equation relates the positive variables $a$ and $b$. Which equation correctly expresses $a$ in terms of $b$?

A

$a=\frac{4b}{25}$

B

$a=\frac{4b^2}{25}$

C

$a=\frac{2b}{5}$

D

$a=\frac{2b^2}{5}$