a) 3/4 - 2/15x = 29/60
-2/15x = 29/60 - 3/4
-2/15x = -4/15
x = -4/15 : -2/15
x = 2
Vậy x = 2
b) 7/5 - 2/5x = 1 - 3/20
-2/5x = 17/20 - 7/5
-2/5x = -11/20
x = -11/20 : -2/5
x = 11/8
Vậy x = 11/8
c) 30%. x - x + 5/6 = 1/3
(30% - 1). x = 1/3 - 5/6
-7/10x = -1/2
x = -1/2 : -7/10
x = 5/7
Vậy x = 5/7
d) 3/4x - 1/4 = 2. (x - 3 ) + 1/4x
3/4x - 1/4x - 2. (x - 3) = 1/4
1/2x - 2x + 2. 3 = 1/4
-3/2x + 6 = 1/4
-3/2x = 1/4 - 6
-3/2x = -23/4
x = -23/4 : -3/2
x = 23/6
Vậy x = 23/6