Respuesta :
6 - 4x = 7x - 9x + 4
6 - 4x = -2x + 4
+ 4x + 4x
6 = 2x + 4
- 4 - 4
2 = 2x
2 2
1 = x
6 - 4x = -2x + 4
+ 4x + 4x
6 = 2x + 4
- 4 - 4
2 = 2x
2 2
1 = x