Final answer:
The equation 3x - 6 = 15 can be solved for x by first adding 6 to both sides and then dividing both sides by 3, yielding the solution x = 7.
Step-by-step explanation:
We can solve the equation 3x − 6 = 15 for x by performing algebraic operations. We start by adding 6 to both sides of the equation to isolate terms with x on one side:
3x − 6 + 6 = 15 + 6
3x = 21
Next, we divide both sides by 3 to solve for x:
3x / 3 = 21 / 3
x = 7
The solution to the equation 3x − 6 = 15 is x = 7. Therefore, the correct answer is a. x = 7.