To solve the equation, we distribute the 3 to both terms inside the parentheses:
3x + 6 - 6 = 3x
The +6 and -6 cancel out:
3x = 3x
Since the term 3x is the same on both sides of the equation, we can subtract 3x from both sides:
3x - 3x = 3x - 3x
0 = 0
The equation 0 = 0 is true for all values of x, which means there are an infinite number of solutions.
Therefore, the answer is B. The equation has infinite solutions.