please solve this completely line by line
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9 - 4x ²
( 3 - 2x ) ( 3 + 2x )
( - 2x + 3 ) ( 2x + 3 )
x³ - x
x ( x² - 1 )
( x - 1 ) ( x + 1 )
x ( x - 1 ) ( x + 1 )
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