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6a^2(a-3)-24(a-3)
(a-3)(6a^2-24)
6(a-3)(a^2-4)
6(a-3)(a+2)(a-2)...Rpta
En el denominador o divisor:
3a(a+2)-9(a+2)
(a+2)(3a-9)
3(a+2)(a-3)...Rpta
Simplificando, queda: 2(a-2)