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36 - 12 (m - 1) = 0
36 - 12 m + 12 = 0
Resulta m = 4
Queda: 3 x² + 6 x + 3 = 3 (x² + 2 x + 1) = 3 (x + 1)² = 0
La única raíz es x = - 1
Saludos Herminio