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9x^2-16 / 3x^2 + 2x -8
= (3x-4)(3x+4) / (3x-4)(x+2)
Karena 3x-4 sama, maka boleh dicoret, sehingga tinggal
3x+4 / x+2 (D)
Semoga membantu
Maaf kalau salah