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10x2y - 4x3y =

9ab² + 3ab - 6a²b =

2x³ + x² - 5x =

3x² - 6xy + 4x - 8y =

x (x³ + x - 5)

(3x²-6xy) + (4x - 8y)

3ab (3b + 1 - 2a)

2x2y(5 - 2x)