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klu salah maaf yaa
=12x³ - 15x³ - 9x² + 7x² -8-5
=3x³ - 2x²-3
2.)9p2² - q² - 3q² - 4 pq + 5 pq=9p² - 4 + pq
3.)12kl-5kl-20mn-3mn
=7kl -23mn
#semoga membantu^_^
jadikan jawaban tercerdas yaa:)