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= 8x³ + 12x² +18x - 18x² - 12x - 27
= 8x³ + 12x² - 18x² + 18x -12x - 27
= 8x³ - 6x² + 6x - 27
= 8x³ + 12x² +18x - 12x² - 18x - 27
= 8x³ + 12x² - 12x² + 18x -18x - 27⇒ diurutkan,djumblahkan berdasarkan variabel
= 8x³ - 27
semoga membantu yyaa
jika variabelnya berbeda tidak bisa dijumblahkan :)