Respuesta:
x = 13
Explicación paso a paso:
9 x + 20 = 3x -2• (3-4x)
9x + 20 = 3x - 6 + 8x
9x + 20 = 11x - 6
20 + 6 = 11x - 9x
26 = 2x
[tex]9 x + 20 = 3x -2 \times (3-4x) \\ \\ 9x + 20 = 3x - 6 + 8x \\ \\ 9x + 20 = 11x - 6 \\ \\ 6 + 20 = 11x - 9x \\ \\ 2x = 26 \\ \\ x = \frac{26}{2} \\ \\ x = 13[/tex]
