Final answer:
The value of x in the equation 3(x - 4) = 18 is 10.
Step-by-step explanation:
To solve the equation 3(x - 4) = 18, we need to isolate the variable x. Here's how:
Distribute the 3 to the terms inside the parentheses: 3x - 12 = 18.
Add 12 to both sides of the equation: 3x = 30.
Divide both sides by 3: x = 10.
Therefore, the value of x is 10 (option D).