Tìm x: x.(x - 3) - 2x + 6 = 0

bài 2:Tìm x:
a,x.{x-3}-2x+6=0
b,{3x-2}.{2x-3}-x{6x-4}=11
c,1/2x^3-8x=0
d,{2x+1/2}^2-{1-2x}^2=0