For this case we have the following equation: 5x / 6x + 3 The denominator of the equation must be different from zero. Therefore, we have: 6x + 3 = 0 From here, we clear x: 6x = -3 x = -3/6 x = -1/2 Answer: the nonpermissible replacement for the variable in this expression is: B.-1/2
