Solve:
$x^{11} \div x^{15}$

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Solution

$\begin{matrix} x^{11} \div x^{15} \Rightarrow x^{11 - 15} = x^{- 4} = \frac{1}{x^{4}} [a^{- 1} = \frac{1}{a}] \end{matrix}$

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