Nafis HLH, Usodo B, Siswanto S, Nurhasanah F. Analysis of Epistemological Obstacles on the Material of Two-variable Linear Equation System. KSS [Internet]. 2025 May 27 [cited 2025 Jul. 20];10(11):257-71. Available from: https://knepublishing.com/index.php/KnE-Social/article/view/18747