Solving sum of one variable with real exponents

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I'm working with an annoying maximisation problem at the moment. I've spent a long time Googling, but I'm not having much success and I suspect it would be simple enough if I had the right tools. I have to solve for $x$ something that is analogous to this $$ \sum_{i= 1}^n y_i x^{\epsilon_i} = B $$ where everything is in the real numbers, $y$ and $\epsilon$ depend on $i$. Is there any way for me to get $x$ in terms of the parameters in that expression?