ADI SUARMAN SITUMORANG; ENJELIKA PANDIANGAN. Analysis Of Mathematical Communication Skills On The Material Of Two-Variable Linear Equation System In Smp Negeri 7 Medan. International Journal Of Humanities Education and Social Sciences (IJHESS) , [S. l.], v. 2, n. 1, 2022. DOI: 10.55227/ijhess.v2i1.243. Disponível em: https://ijhess.com/index.php/ijhess/article/view/243. Acesso em: 22 jun. 2026.