-(2x-4x²-8)(-1/2x²)

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-(2x-4x²-8)(-1/2x²)-(2x-4x²-8)(-1/2x²)-(2x-4x²-8)(-1/2x²)=1/x-2x-4/x

-(2x-4x²-8)(-1/2x²)
-(2x-4x²-8)(-1/2x²)

-(2x-4x²-8)(-1/2x²)
=1/x-2x-4/x