Răspuns :
3 - 4( 4 - 5x ) = 3( 5x + 1 )
3 - 16 + 20x = 15x + 3
- 16x + 20x = 15x
20x - 15x = 16
5x = 16
x = 16/5
3 - 16 + 20x = 15x + 3
- 16x + 20x = 15x
20x - 15x = 16
5x = 16
x = 16/5