Answer
$n=30$
Work Step by Step
$\dfrac{n}{10}=9-\dfrac{n}{5}$
Multiply the whole equation by $10$:
$10\Big(\dfrac{n}{10}=9-\dfrac{n}{5}\Big)$
$n=90-2n$
Solve for $n$:
$n+2n=90$
$3n=90$
$n=\dfrac{90}{3}$
$n=30$
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