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SPENT EDIBLE OIL SOAP ANALYSIS ON CHEMICAL PRACTICUM ACTIVITIES IN SMA HARAPAN III DELI SERDANG. JPK [Internet]. 2022 Jun. 30 [cited 2025 Dec. 6];2(1):11-5. Available from: https://ejournal.medistra.ac.id/index.php/JPK/article/view/1038