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= -2ab -b²
6a² - 7ab + 3b² - 6a² + 5ab - 4b²
6a² - 6a² - 7ab + 5ab + 3b² - 4b²
0 - 2ab - 1b²
jadi, hasilnya : - 2ab - b²
semoga membantu ^_^
jadikan yang terbaik yaahh.. :)