Tìm x: x (x - 4) = 2x - 8

Câu 1 : tìm x : 
a) x ( x - 4 ) = 2x - 8
b) ( 2x + 3 ).( x - 1) + ( 2x - 3).( 1 - x ) = 0
c) 2 ( x + 3 ) - x^2 - 3x = 0
d) x^3 - x^2 = 4x^2 - 8x + 4