Đáp án:
`3. ( 1- 4x ) ( x- 1) + 4( 3x -2) .(x +3) = -27`
`=> 3. ( x -1 - 4x^2 + 4x) + 4( 3x^2 + 9x - 2x -6)=-27`
`=> 3x - 3 - 12x^2 + 12x + 12x^2 + 36x - 8x - 24= -27`
`=> -12x^2 + 12x^2 + 3x - 8x + 36x + 12x - 24 -3= -27`
`=> 43x -27= -27`
`=> 43x = -27 + 27`
`=> 43x = 0`
`=> x= 0`
mong ctlhn ạ~~