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<h1>Solución</h1>

<p>a. &emsp; $f\left( u \right) = {u^7}$, $u = {x \over 7} + {7 \over x}$</p>
<p>b. &emsp; $7{\left( {{x \over 7} + {7 \over x}} \right)^6} \cdot \left( {{1 \over 7} - {7 \over {{x^2}}}} \right)$</p>




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