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20b² - 18a² - 6ab⁶ = 2(10b - 9a² - 3ab⁶) atau dimanipulasi menjadi
18b² - 18a² - 6ab⁶ + 2b² = 18(b² - a²) - 2b²(3ab⁴ - 1)
a²b - 8ab + 2ab² - 4ab² = a(ab - 8b + 2b² - 4b²)