N. . Campanilla, “Integrating Variable to Enhance Problem-Solving Skills of Grade 7 Students in Linear Equations and Inequalities”, Int. Multidiscip. J. Res. Innov. Sustain. Excell. , vol. 1, no. 12, pp. 190–197, Dec. 2024, Accessed: Aug. 25, 2026. [Online]. Available: https://risejournals.org/index.php/imjrise/article/view/893