( x - 1/2 ) : 3/11 =11/4
x - 1/2 = 11/4 x 3/11
x - 1/2 = 3/4
x = 3/4 + 1/2
x = 5/4
Vậy x = 5/4
(2x + 3/8 ) . 7/4 =-21/32
2x + 3/8 = -21/32 : 7/4
2x + 3/8 = -3/8
2x = -3/8 - 3/8
2x = -3/4
x = -3/4 : 2
x = -3/8
Vậy x = -3/8
x - x/3 = 3/57 : 12/19
<=> x - x/3 = 1/19
<=> 2x/3 = 1/19
<=> 2X x 19 = 1 x 3
<=> 2X x 19 = 3
<=> 2x = 3/19
<=> x = 3/38
Vậy x = 3/38