Đáp án:
a) 5x-2/3 = 5-3x/2
<=> 5x-2/3 - 5-3x/2 =0
<=> (5x-2)*2/6 - (5-3x)*3/6 =0
<=> (10x -4 -15 +9x)/6 = 0
<=> 19x -19 =0
<=> 19x = 19
<=> x = 1
b) 10x+3/12 = 1+(6+8x)/9
<=> 10x+3/12 -1 - (6+8x)/9 =0
<=> (10x +3)*3/36 -36/36 - (6+8x)*4/36 =0
<=> (30x +9 -36 -24 -32x)/36 =0
<=> -2x -51 =0
<=> -2x = 51
<=> x=-51/2
c) 2(x +3/5) = 5- (13/5 +x)
<=> 2x +6/5 -5 +13/5 +x =0
<=> 3x = -9/5 +5 -13/5
<=> 3x = 6/5
<=> x = 0.4
d) (7/8)x -5(x-9) = (20x +1.5) /6
<=> (7/8)x -5x +45 - (20x+1.5)/6 = 0
<=> (21/24)x - (120x/24) - (20+1.5)*4/24 + 1080/24 = 0
<=>( 21x-120x -80x -6 +1080)/24 =0
<=> -179x +1074=0
<=> -179x = -1074
<=> x = 6
