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x² - 15x + 54= 0
》 x² - 9x - 6x + 54 = 0
》 x(x-9) - 6(x-9) = 0
》 (x-6)(x-9) = 0
Therefore, x=6 and x=9.
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Answer is given in the question.
And don't forget to solve my question.
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