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2026. PERAMALAN PENDAPATAN RETRIBUSI PERSAMPAHAN PADA TPA REGIONAL SOLOK MENGGUNAKAN METODE HOLT DOUBLE EXPONENTIAL SMOOTHING. JOURNAL OF SCIENCE AND SOCIAL RESEARCH. 9, 5 (Oct. 2026), 7603 – 7608. DOI:https://doi.org/10.54314/jssr.v9i5.7245.