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I see that you've uploaded an image showing a math problem involving the subtraction of rational expressions. Let me extract the relevant information and help solve the problem for you.

The expression seems to be:

\[
\frac{10}{25a^2 - b^2} - \frac{1}{5a^2 - ab}
\]

The next step is to find a common denominator and simplify the result.

### Step-by-step Solution:

1. **Factor each denominator**:
   - \(25a^2 - b^2\) is a difference of squares, which factors as:
     \[
     25a^2 - b^2 = (5a - b)(5a + b)
     \]
   - \(5a^2 - ab\) can be factored by taking out the common factor of \(a\):
     \[
     5a^2 - ab = a(5a - b)
     \]

2. **Find a common denominator**:
   The least common denominator (LCD) between \((5a - b)(5a + b)\) and \(a(5a - b)\) is:
   \[
   a(5a - b)(5a + b)
   \]

3. **Rewrite each fraction with the LCD**:
   \[
   \frac{10}{(5a - b)(5a + b)} = \frac{10a}{a(5a - b)(5a + b)}
   \]
   \[
   \frac{1}{a(5a - b)} = \frac{(5a + b)}{a(5a - b)(5a + b)}
   \]

4. **Subtract the numerators**:
   Now that the denominators are the same, we subtract the numerators:
   \[
   \frac{10a - (5a + b)}{a(5a - b)(5a + b)}
   \]
   Simplifying the numerator:
   \[
   10a - 5a - b = 5a - b
   \]

5. **Final result**:
   The final expression is:
   \[
   \frac{5a - b}{a(5a - b)(5a + b)}
   \]
   The \(5a - b\) in the numerator and denominator cancel out (as long as \(5a \neq b\)), leaving:
   \[
   \frac{1}{a(5a + b)}
   \]

This is the simplified form of the given expression.

---

Do you want any additional details or clarifications on this? 

Here are five related questions for further practice:
1. How do you simplify rational expressions with multiple terms?
2. What is the difference of squares formula?
3. How do you find a least common denominator (LCD)?
4. How do you handle subtraction when simplifying rational expressions?
5. What steps are involved in factoring quadratic expressions?

**Tip**: When dealing with rational expressions, always check for common factors that can be canceled out after you find a common denominator!

Subtract the rational expressions and simplify the result: (10 / (25a^2 - b^2)) - (1 / (5a^2 - ab))

Learn how to subtract and simplify rational expressions by factoring the denominators and finding a common denominator. This detailed example covers key algebraic concepts like difference of squares and factoring. Suitable for students in Grades 9-11.

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