To evaluate the expression $(-14) + (-7)$, you simply add the two negative numbers:

$-14 + (-7) = -21$

So, the value of the expression is $-21$.

Would you like further details or clarification?

Here are 5 related questions you might find helpful:

1. What is the result of $(-10) + (-8)$?
2. How do you add two negative numbers together?
3. How would you subtract a negative number, such as $(-14) - (-7)$?
4. What is the sum of $(-5) + (-15)$?
5. How do you handle adding a positive number to a negative number?

Tip: When adding two negative numbers, the result is always negative, and the absolute values of the numbers are added together.