Tính:

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3) \((x+1)(x^2-x+1)-x(x-2)(x+2)=2\)

4) \((x-3)(x^2+3x+9)=x(x^2-8)\)

5) \((x-1)^3-(x+3)(x^2-3x+9)+3(x^2-4)=2\)