x - 9 + 3x >= 6
4x >= 6 + 9
4x >= 15
x >= 15/4
x >= 3целых 3/4
x-9+3x>=6
4x-9>=6
4x>=6+9
4х>=15
х>=15/4=3,3/4
x - 9 + 3x >= 6
4x >= 6 + 9
4x >= 15
x >= 15/4
x >= 3целых 3/4
x-9+3x>=6
4x-9>=6
4x>=6+9
4х>=15
х>=15/4=3,3/4