a. 8x + | -3 | = -4x + 39
<=> 8x+3=-4x+39
<=>8x+3+4x-39=0
<=>12x-36=0
<=>12x=36
<=>x=3
Vậy x=3
b. 6( x - 2 ) + ( -2 ) = 20 - 4x
<=>6x-12-2=20-4x
<=>6x-14=20-4x
<=>6x-14-20+4x=0
<=>10x-34=0
<=>10x=34
<=>x=3,4
Vậy x=3,4
6(x-2)+(-2)=20-4x
<=> 6x-12-2-20+4x=0
<=> 10x-34=0
<=> 10x=34
<=> x=\(\frac{34}{10}=\frac{17}{5}\)