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= 3 pangkat n x 3¹ - 3 pangkat n / 3 pangkat n + 3 pangkat n x 3 pangkat ⁻¹
= 3 pangkat n-n + 3¹ ⁻ ⁻¹ - 3 pangkat n-n
= 3 + 3² - 3
= 3 + 9 - 3
= 12 - 3 = 9