Uniform convergence of $\sum_{n=1}^{+\infty}(-1)^n\frac{x}{x+e^{-nx}} $

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I have found there is pointwise convergence in $(-\infty,0] $ and using Weierstrass theorem uniformly convergence in $(-\infty,a],a<0$. Can I use Leibniz to prove uniformly convergence in $(-\infty,0]$?

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No, you cannot, since the Leibniz test is for convergence of numerical series, not for uniform convergence of series of functions. But you can apply Dirichlet's test.