Brianna's teacher asks her which of these three expressions are equivalent to each other.
expression a: 9x - 3x - 4
expression b: 12x - 4
expression c: 5x + x - 4
brianna says that all three expressions are equivalent because the value of each one is -4 when x = 0
brianna's thinking is incorrect. yes or no
identify the error in brianna's thinking. determine which of the three expressions are equivalent.