Which of the answer choices would result in the same solution as the following expression? Choose all correct answers. 2/3 + (−1/3) (20 points) Responses −4/9+7/9 negative 4 ninths plus 7 ninths 1/3−2/3 1 third minus 2 thirds −1/3+2/3 negative 1 third plus 2 thirds 1/6+1/6 1 sixth plus 1 sixth 5/12+(−1/12)