Question: How may one simplify and solve equations with Maple?

Suppose one has the following equation,


Based on that equation, I have two questions:

1. How may one solve it for \kappa using Maple?

2. How may we simplify it?

Thanks in advance.

Ps: I have tried to use the "solve" and "simplify" commands. However, Maplesoft does not return a result but rather the same equation.

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