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Eliminamos paréntesis usando la ley de los signos
4x + 12x - 54x - 34x + 56 = 0
Eliminamos términos semejantes
16x - 88x + 56 = 0
- 72x = - 56
x = -56/-72
x = 56/72
Usamos una fracción equivalente para simplificar (dividimos entre 8)
x = 7/9