Tìm x

x : (-1/3)^3 =-1/3
( x+ 0.7 )^3 = -27
( 2x - 3 ) ^2 =16= 4^2= (-4 )^2
(2/5 - 3x)^2 =9/25
( x+1/2) . ( 1-1/2 x ) =0