1/9x^2 - 2/3x + 1 = 0.
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x²/9 - 2x/3 + 1 = 0
Multiply throughout by 9
⇒ x² - 6x + 9 = 0
⇒ x² - 3x - 3x + 9 = 0
⇒ x (x - 3) - 3(x - 3) = 0
⇒ (x - 3) (x - 3) = 0
∴ x = 3 or 3
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