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Math·Advanced Math·Equivalent expressions

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$f=\frac{(10x{)}^2}{7g}$
The given equation relates the positive numbers $f$, $x$, and $g$. Which equation correctly expresses $x$ in terms of $f$ and $g$?

A

$x=\frac{\sqrt{7fg}}{10}$

B

$x=10\sqrt{7fg}$

C

$x=\sqrt{\frac{7fg}{10}}$

D

$x=\sqrt{7fg}-10$