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⇒ ( 4x² - 2x ) + ( 14x - 7 )
⇒ 2x ( 2x - 1 ) + 7 ( 2x - 1 )
⇒
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4x² - 35x - 9 ⇒ 4x² - x + 36x - 9
⇒ ( 4x² - x ) + ( 36x - 9 )
⇒ x ( 4x - 1 ) + 9 ( 4x - 1 )
⇒
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x² - 3x - 108 ⇒