Let's evaluate the expression:

$\left(-\frac{6}{5}\right) + \left(-\frac{9}{5}\right)$

Since both fractions have the same denominator, we can add the numerators directly:

$\frac{-6}{5} + \frac{-9}{5} = \frac{-6 + (-9)}{5} = \frac{-15}{5}$

Now, simplify the fraction:

$\frac{-15}{5} = -3$

So, the result is:

$-3$

Would you like further details or explanations?

Here are some related questions:

1. What is the rule for adding fractions with the same denominator?
2. How do you handle adding negative fractions?
3. What happens when you simplify a fraction to a whole number?
4. How do you add mixed numbers?
5. How do you convert a fraction to a decimal?

Tip: Always check if a fraction can be simplified by dividing both the numerator and denominator by their greatest common divisor (GCD).