Let's solve the expression step by step:

Given expression: $76 - 9(6 + 8)$

1. Calculate the expression inside the parentheses: $6 + 8 = 14$

2. Multiply by 9: $9 \times 14 = 126$

3. Subtract from 76: $76 - 126 = -50$

So, the value of the expression $76 - 9(6 + 8)$ is $-50$.

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

Here are some related questions that might interest you:

1. What is the order of operations in mathematical expressions?
2. How do parentheses affect the outcome of a mathematical expression?
3. Can you explain how to solve expressions with multiple parentheses or brackets?
4. What are some examples of real-life applications of arithmetic expressions?
5. How do you perform arithmetic operations with negative numbers?

Tip: Always remember the order of operations: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right), often abbreviated as PEMDAS.