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Martha Yolandia Sinaga 2023. The Influence of Teacher Competency and Student Learning Motivation On The Learning Achievement Of Economics Class X Students Of SMA Negeri 12 Medan In Academic Year 2014/2015. Outline Journal of Education. 2, 2 (Aug. 2023), 58–61. DOI:https://doi.org/10.61730/oje.v2i2.170.