TH1: x < 0 ( x âm )
| 2x - 4 | - | x - 3 | = - 4x
<=> - 2x - 4 - ( - x - 3 ) + 4x = 0
<=> - 2x - 4 + x + 3 + 4x = 0
<=> 3x - 1 = 0
<=> x = 1/3
Th2 : x > 0 ( x dương )
| 2x - 4 | - | x - 3 | = - 4x
<=> 2x - 4 - x + 3 + 4x = 0
<=> 5x - 1 = 0
<=> x = 1/5TH1: x < 0 ( x âm )
| 2x - 4 | - | x - 3 | = - 4x
<=> - 2x - 4 - ( - x - 3 ) + 4x = 0
<=> - 2x - 4 + x + 3 + 4x = 0
<=> 3x - 1 = 0
<=> x = 1/3
Th2 : x > 0 ( x dương )
| 2x - 4 | - | x - 3 | = - 4x
<=> 2x - 4 - x + 3 + 4x = 0
<=> 5x - 1 = 0
<=> x = 1/5
bạn tham khảo