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⇒ ( 20x² - 9x ) + ( 40x - 18 )
⇒ x ( 20x - 9 ) + 2 ( 20x - 9 )
⇒
6a² - 5ab - 6b² ⇒ 6a² - 9ab + 4ab - 6b²
⇒ ( 6a² - 9ab ) + ( 4ab - 6b² )
⇒ 3a ( 2a - 3b ) + 2b ( 2a - 3b )
⇒