Adi Suarman Situmorang, Enjelika Pandiangan. Analysis Of Mathematical Communication Skills On The Material Of Two-Variable Linear Equation System In Smp Negeri 7 Medan. IJHESS [Internet]. 2022 Aug. 31 [cited 2026 Jun. 22];2(1). Available from: https://ijhess.com/index.php/ijhess/article/view/243