Bài 8: Tìm x, biếta) (x-3)(x^2+3x+9)-x(x+4)(x-4)=5b) (x-2)^3-(x+5)(x^2-5x+25)+6x^2=11c) (x+3)^3-x(3x+1)^2+(2x+1)(4x^2-2x+1)-3x^2=54d) (x-3)^3-(x-3)(x^2+3x+9)+6(x+1)^2+3x^2=-33
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