Factorize (6a-5b)^2 - 9(a-2b)^2
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(6a-5b)² - 9(a-2b)²
(36a²+25b²-60ab) - 9(a²+4b²-4ab)
(36a²+25b²-60ab) - 9a²-36b²+36ab
(36a² - 9a²) + (25b² - 36b²) + (-60ab + 36ab)
27a² - 11b² - 24ab
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