Let's simplify each expression step by step:
Expression 1: (7x + 3)
This expression is already simplified and cannot be further simplified.
Expression 2: (x - 9)
This expression is already simplified and cannot be further simplified.
Now, let's simplify the overall expression by subtracting Expression 2 from Expression 1:
(7x + 3) - (x - 9)
To subtract the second expression, we distribute the negative sign to every term inside the parentheses:
7x + 3 - x + 9
Next, we combine like terms:
(7x - x) + (3 + 9)
Simplifying further:
6x + 12
Therefore, the simplified expression is 6x + 12.