Tìm x ( x + 2 ) . ( x - 4 ) - ( x + 5 ) . ( x - 5 ) =0

tìm x
a) ( x + 2 ) . ( x - 4 ) - ( x + 5 ) . ( x - 5 ) =0

b ) ( 2x -3 ) ^2 - 4 . ( x - 1 ) . ( x + 1 ) = 0