Siahaan MML, Fitriani, Leli ARDL. A Study of Learning Obstacles: Determining Solutions of a System of Linear Equation Using Gauss-Jordan Method. MOS [Internet]. 2023 Jan. 31 [cited 2024 Jul. 5];12(1):25-34. Available from: https://journal.institutpendidikan.ac.id/index.php/mosharafa/article/view/748