Evaluate `lim_(x to a) ((x + 3)^(7//5) - (a + 3)^(7//5))/(x - a)`

Explanation

To evaluate the limit

\[ \lim_{x \to a} \frac{(x + 3)^{\frac{7}{5}} - (a + 3)^{\frac{7}{5}}}{x - a}, \]

we can use the formula for the limit of the form

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