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= 3(x-2)/(x+2)(x-2)
= 3/(x+2)
= (6x . (x-2)) - (3 . (x²-4)) / (x²-4)(x-2)
= (6x²-12x) - (3x²-12) / (x³-2x²-4x+8)
= 3x²-12x+12 / x³-2x²-4x+8
x³-2x²-4x+8 = 3x²-12x+12
= x³ - 2x² - 3x² - 4x + 12x + 8 - 12
= x³ - 5x² + 8x - 4