(x-3)²-9=0

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(x-3)²-9=0
(x-3)²-9=0

(x-3)²-9=0
（x - 3）² - 9 = 0
（x - 3）² = 9
x - 3 = ± 3
x = ± 3 + 3
x1 = 3 + 3 = 6
x2 = - 3 + 3 = 0