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X-[5+2x- 6 + 9x]=30x+[- 3x - 12 - x - 3]
X-[- 1 + 11x]=30x+[- 4x - 15]
x + 1 - 11x = 30x - 4x - 15
x - 11x -30x + 4x = - 15 - 1
5x - 41x = - 16
- 36x = - 16
x = -16 / -36
x = 0,44. O' x - 0,44 = 0
Espero que te sirva está respuesta