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⇒ ( 4x² - 10x ) + ( 6x - 15 )
⇒ 2x ( 2x - 5 ) + 3 ( 2x - 5 )
⇒
2x² + x - 3 ⇒ 2x² - 2x + 3x - 3
⇒ ( 2x² - 2x ) + ( 3x - 3 )
⇒ 2x ( x - 1 ) + 3 ( x - 1 )
⇒