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= (12x -4 -5x -15)/(x² + 2x - 3)
= (7x - 19)/(x²+2x_3)
b) ={ 3(3x-4) + 2(2x+5)} / (2x+5)(3x-4)
= (9x-12+4x +10)/(2x+5)(3x-4)
= (13x - 2)/(6x²+7x-20)
d) = (x+6)(x-2)/(x+6)(2x-3)
= (x-2)/(2x-3)