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= -12k²l - 9kl² - 18k²l - 8kl²
= -30k²l -17kl²
= -kl (30k + 17l)
= -12k²l -9kl² -18k²l -8kl²
= -12k²l -18k²l -9kl² -8kl²
= -30k²l -17kl²
Itu jawabannya.