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Math·Advanced Math·Equivalent expressions

hard

$18qrt-2qrs+10rst=0$
In the given equation, $q,r,s$, and $t$ are positive, and $\frac{q}{t}$ is greater than $5$. Which expression is equivalent to $s$?

A

$\frac{-9qt}{q-5t}$

B

$\frac{9qt}{q-5t}$

C

$18qrt$

D

$\frac{2qt}{q-5t}$