To determine the number of solutions for the equation, let's solve for x:
3(x+2) - 6 = 3x
3x + 6 - 6 = 3x
3x = 3x
By subtracting 3x from both sides, we get 0 = 0.
Since 0 = 0, this means that all values of x will satisfy the equation. Therefore, the equation has infinite solutions.
The correct answer is D. The equation has infinite solutions.