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4C²-20-6c²-8
-2c²-28
-2(c²+14)
4(c² - 5) - 2(3c² + 4) = 4c² - 20 - 6c² - 8
= 4c² - 6c² - 20 - 8
= -2c² - 28
Semoga membantu ^^