If \( \lim _{x \rightarrow(-a)} \frac{x^{7}+a^{7}}{x+a}=7 \), then the value of \( a \) is

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If \( \lim _{x \rightarrow(-a)} \frac{x^{7}+a^{7}}{x+a}=7 \), then the value of \( a \) is
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