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3x² - 6xy + 4x - 8y =

6·2x + 6·3y - 6· 4z =

9ab² + 3ab - 6a²b =

2x³ + x² - 5x =

6(2x + 3y - 4z )

x (x³ + x - 5)

3x (x - 2y) + 4(x - 2y)

3ab (3b + 1 - 2a)