Final answer:
The question does not provide enough information to solve for variable u. However, in a physics context, steps to solve for u typically involve identifying known velocities, using the appropriate relativistic equation, and checking if the solution is reasonable.
Step-by-step explanation:
The given question appears to be related to either algebra or physics, specifically dealing with solving for a variable, which could be velocity in the context of physics. Unfortunately, the initial equation or expression is not clearly provided in the question. Therefore, with the information given, it is not possible to provide a specific solution without the complete problem statement.
However, using the reference information provided, let's assume the topic is about relative velocities, specifically within the context of the theory of relativity. The steps outlined would be consistent with the process of solving for a relative velocity (denoted u) in such a context. Let's look at the steps that would be involved:
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Without the specific relativistic formula, the problem cannot be solved here, but these steps outline the process that you would follow if the equation were provided