Limit of $(1 + \frac{1}{5x})^{7x}$ as $x$ approaches $0$

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I have to find the limit of the function given in the title. My calculator says that the limit is undefined, wolfram alpha says it is 1, I am confused but I think that the calculator is right since $\frac{1}{5x}$ is also undefined as $x$ approaches $0$. Can you guys tell me what is the correct limit?