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3(6a²-6ab) + 3(-4a-6ab) + 4a - 4b
18a² - 18ab - 12a - 18ab + 4a -4b
18a² - 18ab - 18ab -12a + 4a - 4b
18a² - 36ab - 8a - 4b
maaf klo salah :v