Tìm x: (x + 1)(x^2 - x + 1) - x(x - 5)(x + 3) = 8

a) (x+1)(x^2-x+1)-x(x-5)(x+3)=8
b) 4x^2(x-2)-x+2=0
c) (3x+1)^2-4(x-1)^2=0
d) 4x^2-9=(3x+1)(2x-3)
e) (x^2+2)(x-4)-(x-2)^3=-16
f) (x-2)^3-(x+5)(x^2-5x+25)-6x^3=11
g) x^3-3x^2+3x+7=0
h) x^2-4x+3=0
i) 2x^2-5x+2=0