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12 x^3 + 12 x^2 + 8 x^2 - 8 x + 7 x - 6
12 x^3 + 20 x^2 - x - 6
(12 x^3 +20 x^2 - 6) - x
{(12 x ^2 + 24) (12 x - 3)} - x
x = - 24/12. ; x = 3/12 ; -x
x = - 2 ; x = 1/4 ; x = 0
Espero que te sirva la respuesta