factories 1 - 6 x + 9square
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1 - 6x + 9x²
9x² - 6x - 1
9x² - 3x - 3x + 1
3x ( 3x - 1 ) - 1 ( 3x - 1 )
( 3x - 1 ) ( 3x - 1 )
( 3x - 1 ) ² = 0
x = 1/3
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