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Verified answer
(2x² - 5x - 12) / (4x² - 9)= (2x²-8x)+(3x-12) / (2x+3)(2x-3)
= 2x(x-4)+3(x-4) / (2x+3)(2x-3)
= (2x+3)(x-4) / (2x+3)(2x-3)
= (x-4) / (2x-3)
(x² - 6x + 9) / (x² - x - 6)
= (x²-3x)-(3x+9) / (x²-3x)+(2x-6)
= x(x-3)-3(x-3) / x(x-3)+2(x-3)
= (x-3)(x-3) / (x+2)(x-3)
= (x-3) / (x+2)