To simplify the given expression: 4x + 8 + (6x - 7) - (8x + 9), we can follow the order of operations (parentheses, exponents, multiplication and division, and addition and subtraction) to simplify it step by step.
First, let's simplify the expression inside the parentheses:
6x - 7 becomes 6x - 7
8x + 9 becomes 8x + 9
Now, let's simplify the entire expression:
4x + 8 + 6x - 7 - 8x - 9
Combining like terms:
(4x + 6x - 8x) + (8 - 7 - 9)
2x - 8
Therefore, the simplified form of the expression 4x + 8 + (6x - 7) - (8x + 9) is 2x - 8.