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x² - 16 = 9
x² - 25 = 0
(x + 5)(x - 5) = 0
x = - 5 atau x = 5
yg memenuhi adalah x = 5
³log (x-4)(x+4) = 3Log 9
X²+4x-4x-16 = 9
X² -16 = 9
X = √25
X = 5