b) (8x-3)/4 - (3x-2)/2 = (2x-1)/2 + (x+3)/4
<=> 2x- 3/4 - 3x/2 +1 = x -1/2 + x/4 +3/4
<=> 2x- 3x/2 -x- x/4 = -1/2 +3/4 + 3/4 -1
<=> x (2- 3/2 -1- 1/4) =0
<=> x. (-3)/4 =0
<=> x=0
Vậy x=0

c) (x-1)/2 - (x+1)/15 - (2x-13)/6 = 0
<=> 15(x-1)/30 - 2(x+1)/30 - 5(2x-13)/30=0
<=> [15(x-1) - 2(x+1) - 5(2x-13)]/30 =0
<=> (3x+48)/30=0
<=> 3x+48=0
<=> x= -16
Vậy x=-16

d) 3(3-x)/8 + 2(5-x)/3 =(1-x)/2 -2
<=> 3(3-x)/8 + 2(5-x)/3 - (1-x)/2 + 2 =0
<=> 9(3-x)/24 + 16(5-x)/24 - 12(1-x)/24 + 48/24 =0
<=> [9(3-x) +16(5-x) -12(1-x) +48]/24=0
<=> 9(3-x) +16(5-x) -12(1-x) +48=0
<=> -13x+143=0
<=> 13x=143
<=> x=11
Vậy x=11

e) 3(5x-2)/4 - 2= 7x/3 - 5(x-7)
<=> 15x/4 - 6/4 -2 =7x/3 - 5x +35
<=> 15x/4 -7x/3 +5x = 35 +2 +6/4
<=> x( 15/4 -7/3 +5)= 77/2
<=> x. 77/12 = 77/2
<=> x= 6
Vậy x=6

f) (x+5)/2 + (3-2x)/4 = x- (7+x)/6
<=> 6(x+5)/12 + 3(3-2x)/12 = 12x/12 - 2(7+x)/12
<=> 6(x+5)/12 + 3(3-2x)/12 - 12x/12 + 2(7+x)/12=0
<=> [ 6(x+5) + 3(3-2x)- 12x+ 2(7+x) ]/12=0
<=> (-10x +53)/12=0
<=> 53-10x=0
<=> 53=10x
<=> x=53/10
Vậy x=53/10

g) (x-3)/11 + (x+1)/3 = (x+7)/9 -1
<=> x/11 - 3/11 +x/3 +1/3 = x/9 +7/9 -1
<=> x/11 +x/3 - x/9= 7/9-1+3/11-1/3
<=> -31/99.x = -28/99
<=> x= 28/31

h) (3x-0,4)/2 + (1,5-2x)/3 = (x+0,5)/5
<=> 3x/2 - 0,4/2 +1,5/3 -2x/3 = x/5 +0,5/5
<=> 3x/2 -1/5 +1/2 - 2x/3 = x/5+ 1/10
<=> 3x/2 -2x/3 -x/5= 1/10 +1/5 -1/2
<=> 19/30 .x = -1/5
<=> x=-6/19

4a
x/3 - 5x/6 -15x/12 = x/4 - 5
<=> x/3 - 5x/6 -15x/12 - x/4 + 5 = 0
<=> 4x/12 - 10x/12 - 15x/12 - 3x/12 + 60/12 = 0
<=> (4x - 10x - 15x - 3x + 60)/12 = 0
<=> 4x - 10x - 15x - 3x + 60 = 0
<=> -24x + 60 = 0
<=> -24x = -60
<=> x = 2,5
Vậy x = 2,5
4b
b) (8x - 3)/4 - (3x - 2)/2 = (2x - 1)/2 + (x + 3)/4
<=> (8x - 3)/4 - (6x - 4)/4 = (4x - 2)/4 + (x + 3)/4
<=> 8x - 3 - 6x + 4 = 4x - 2 + x + 3
<=> 2x + 1 = 5x + 1
<=> x = 0
Vậy x = 0

4c
(x - 1)/2 - (x + 1)/15 - (2x - 13)/6 = 0
<=> (15x - 15)/30 - (2x + 2)/30 - (10x - 65)/30 = 0
<=> (15x - 15 - 2x - 2 - 10x + 65)/30 = 0
<=> 15x - 15 - 2x - 2 - 10x + 65 = 0
<=> 3x + 48 = 0
<=> 3x = -48
<=> x = -16
Vậy x = -16
4d
3(3 - x)/8 + 2(5 - x)/3 = (1 - x)/2 - 2
<=> (9 - 3x)/8 + (10 - 2x)/3 = (1 - x)/2 - 2
<=> (27 - 9x)/24 + (80 - 16x)/24 = (12 - 12x)/24 - 48/24
<=> 27 - 9x + 80 - 16x = 12 - 12x - 48
<=> 107 - 25x = -36 - 12x
<=> -25x + 12x = -36 - 107
<=> -13x = -143
<=> x = 11
Vậy x = 11