Difficulties faced by eighth grade students in the learning of linear equation problems at a high school in Heredia. Uniciencia, [S. l.], v. 28, n. 2, p. 15–44, 2014. Disponível em: https://www.revistas.una.ac.cr/index.php/uniciencia/article/view/6009.. Acesso em: 28 apr. 2024.