The expression $12 + (-6)$ can be simplified by adding 12 and -6 together.

$12 + (-6) = 12 - 6 = 6$

Thus, the result is $6$.

Would you like more details or have any questions?

Here are 5 related questions to expand your understanding:

1. What is $-12 + 6$?
2. How would you solve $12 + (-8)$?
3. What is the result of $6 + (-3)$?
4. Can you explain how to add positive and negative numbers?
5. What is the difference between adding two positive numbers and adding a positive and negative number?

Tip: When adding a negative number, it's the same as subtracting its absolute value from the other number.