It seems like you're asking for clarification on a mathematical expression involving \( r \) and \( u(sr) \). However, your notation isn't entirely clear, so let me clarify a few possible interpretations:

1. **Expression involving \( r \)**:
   If you meant to ask for the value of \( r \) in the equation:
   \[
   -\frac{1}{u(sr)} = \ldots
   \]
   Where \( u(sr) \) is some function of \( r \), then we would need more information about the right-hand side or the exact form of the function \( u(sr) \).

2. **Could be a physics formula**:
   If \( u(sr) \) refers to some physical variable (for example, velocity, energy, etc.) that is a function of \( sr \), where \( sr \) could be some parameter involving \( r \), again, more context would be needed to solve for \( r \).

Could you provide more details or context to clarify the equation or problem you're working on?

Let me know if you'd like further clarification, and here are a few follow-up questions that might help:
   
1. What is \( u(sr) \)? Is it a known function or variable?
2. Are there any additional terms or equations related to \( r \)?
3. Is this a physics-related problem? 
4. Are you trying to isolate \( r \) or find its value numerically?
5. Does \( u(sr) \) involve square roots, exponents, or other operations?

### Tip: When dealing with functions, clearly defining all variables will help in understanding how to solve for unknowns.

Explore the mathematical expression -1/u(sr) and understand how to find the value of r. This problem involves concepts such as functions, variables, and equations. Suitable for college-level students.

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