đầu: -4(x-3)=6x+(x-3)
-4x+12=6x+x-3
-4x+12=7x-3
-4x-7x=-3-12-11
x=-15...x=15/11
1- (3x-2)/3-2=(4x+1)/4
3x-2/1 = 4x+1/4
3x-2 = 4x+1/4
12x-8 = 4x+1
12x-4x = 1+8
8x = 9
....
x=9/8 hoặc x=1/1/82
2- (x-3)/4+(2x-1)/3=(2-x)/6
3(x-3)+4(2x-1) = 2(2-x)
3x-9+8x-4 =4-2x
11x-13 =4-2x
11x+2x =4+13
13x =17
....
x=17/13 hoặc x=1/4/133
3- 1/2 (x+1)+1/4 (x+3) =3-1/3 (x+2)
1/2x+1/2+1/4x+3/4=3-1/3x-2/3
1/2x+5/4+1/4x = 7/3-1/3x
6x+15+3x = 28-4x
9x+15 = 28-4x
9x+4x = 28-15
13x = 13
....
x=1