Anybody knows how to solve this:
I was solving a problem which ended on solving this one, then I was trapped.
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That's a transcendental equation. You'll have to solve it numerically.
Thanks, can you explain more?
There is no known closed-form algebraic solution to that equation. The best you can do is, given a particular value for a, use a computer (most likely) to solve for x. You could try Newton-Raphson or something similar.
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