Uyen BP, Tong DH, Han NN. Enhancing Problem-Solving Skills of 8th-Grade Students in Learning the First-Degree Equations in One Unknown. 61 [Internet]. 2021 Aug. 11 [cited 2024 May 2];9(3):568-87. Available from: http://archive.conscientiabeam.com/index.php/61/article/view/726