Question 806668
You CANNOT divide by zero. So 6x+3 cannot be zero. If it were, then...


6x+3 = 0


6x = -3


x = -3/6


x = -1/2


So if x = -1/2, then the denominator 6x+3 is 0. This is why x = -1/2 is the value that's not allowed (to avoid division by zero)