bài 10 
a) 3 1/2 - 1/2x = 2/3 <=> x = 17/3
b) 1/3 + 2/3 : x = -7 <=> x = -1/11
c) 1/3x - 2/5(x - 1) = 0 <=> (1/3 - 2/5)x + 2/5 = 0 <=> x = 6
d) (2x - 3)(6 - 2x) = 0 <=> 2x - 3 = 0 <=> x = 3/2 or 6 - 2x = 0 <=>  x= 3
e) x : 3/4 + 1/4 = -2/3 <=> x = -11/9
f) -2/3 - 1/3(2x - 5) = 3/2 <=> x = -1/3(2x - 5) = 13/6 <=> 2x - 5 = -13/2 
<=> x = -3/4
h) (2x + 3/5)^2 - 9/25 = 0 
<=> (2x + 3/5 + 3/5)(2x + 3/5 - 3/5) = 0
<=> 2x = -6/5 <=> x = -3/5 or 2x = 0 <=> x = 0