To solve $12 + \frac{6}{-3}$, follow the order of operations (PEMDAS: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right)):

1. First, divide $6$ by $-3$: $\frac{6}{-3} = -2$

2. Now add $12 + (-2)$: $12 + (-2) = 10$

Thus, $12 + \frac{6}{-3} = 10$.

Would you like any more details, or do you have any questions?

Here are 5 related questions for practice:

1. What is $15 + \frac{9}{3}$?
2. How would you simplify $8 - \frac{12}{4}$?
3. Solve $20 + \frac{16}{-4}$.
4. What is $5 \times \left( \frac{18}{6} \right) + 2$?
5. Solve $12 - \frac{18}{3} + 4$.

Tip: Always handle division before addition or subtraction unless parentheses dictate otherwise!